Uploaded by Chanda Goodson

KDC-Senior-Secondary-Mathematics-Past-Exam-2016-2018-Questions-with-Answers

advertisement
A QUICK LOOK AT MATHEMATICS PAPER 2 SYLLABUS D (4024/2)
FINAL EXAMINATION QUESTIONS (2016– 2018) WITH ANSWERS
MATHEMATICAL FORMULAE
οΏ½ π‘Žπ‘Žπ‘₯π‘₯ 𝑛𝑛 𝑑𝑑𝑑𝑑 =
π‘Žπ‘Žπ‘Žπ‘Ž 𝑛𝑛 +1
+ 𝑐𝑐
𝑛𝑛 + 1
1
Conical Frustum 𝐕𝐕 = πœ‹πœ‹(𝑅𝑅2 𝐻𝐻 − π‘Ÿπ‘Ÿ 2 β„Ž)
3
1
Pyramid frustum with a square base and top 𝐕𝐕 = β„Ž(𝐿𝐿2 + 𝑙𝑙2 + 𝐿𝐿𝐿𝐿)
Mean = π‘₯π‘₯Μ… =
∑ 𝑓𝑓𝑓𝑓
∑ 𝑓𝑓
, 𝑆𝑆𝑆𝑆 = οΏ½οΏ½
∑ 𝑓𝑓(π‘₯π‘₯−π‘₯π‘₯Μ… )2
∑ 𝑓𝑓
3
οΏ½ = οΏ½οΏ½
π‘›π‘›π‘‘π‘‘β„Ž 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 𝑓𝑓𝑓𝑓𝑓𝑓 𝐀𝐀𝐀𝐀: 𝑇𝑇𝑛𝑛 = π‘Žπ‘Ž + (𝑛𝑛 − 1)𝑑𝑑,
𝑛𝑛
𝐀𝐀𝐀𝐀: 𝑺𝑺𝒏𝒏 = [2π‘Žπ‘Ž + (𝑛𝑛 − 1)𝑑𝑑], 𝐆𝐆𝐆𝐆: 𝑺𝑺𝒏𝒏 =
2
∑ 𝑓𝑓π‘₯π‘₯ 2
∑ 𝑓𝑓
− (π‘₯π‘₯Μ… )2 οΏ½
𝐆𝐆𝐆𝐆: 𝑇𝑇𝑛𝑛 = π‘Žπ‘Žπ‘Ÿπ‘Ÿ 𝑛𝑛−1
(1−π‘Ÿπ‘Ÿ 𝑛𝑛 )
1−π‘Ÿπ‘Ÿ
,r<1
Cosine Rule for βˆ†π€π€π€π€π€π€: π’‚π’‚πŸπŸ = π’ƒπ’ƒπŸπŸ + π’„π’„πŸπŸ − πŸπŸπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒπ’ƒ
Compiled & Solved by Kachama Dickson. C & Chansa John
Contacts: 0966295655/0955295655/0976221226
Email: kachamadickson@gmail.com
: Johnchansa1992@gmail.com
© 2019
Page 2 of 84
Both Mr. Kachama. D.C and Mr. Chansa J are graduates from the Copperbelt University
(CBU). Kachama D.C is a holder of bachelor’s degree in Mathematics Ed (BSc MA.Ed)
while Mr. Chansa. J is a holder of bachelor’s degree in Pure and Applied mathematics. To
show their competence and eligibility in mathematics, the two individuals have produced
many mathematics pamphlets and this is one of their best joint pamphlet.
This pamphlet consists of final examination questions from 2016 - 2018 for both grade
twelve (12) and G.C.E ordinary levels. Answers with all necessary working methods are
shown at the end of questions. All the Questions are copied directly from the examination
past papers for both July/August and October/ November exams.
“We believe, this pamphlet will be of great help to you even as you prepare for your final
examinations:”
TABLE OF CONTENTS
Topic
page
1. Algebra ……………………………………………………………………………........ 3
2. Matrices …………………………………………………………………...……….…... 4
3. Sets……………………………………………………………………………………… 5
4. Probability ……………………………………………………………………………… 7
5. Sequences & Series …………………………………………………………………….. 8
6. Pseudo code & Flow chart…………………………………………………………….... 9
7. Loci & Construction …………………………………………………………….…….. 12
8. Calculus …………………………………………………………………...…………… 14
9. Vector Geometry ……………………………………………………………………… 15
10. Trigonometry …………………………………………………………………..…...… 17
11. Mensuration ………………..……………………………………………………….… 20
12. Earth Geometry ……………………………………………………………………….. 22
13. Quadratic Function …………………………………………………………………… 24
14. Linear Programming ………………………………………………………………….. 28
15. Statistics ………………………………………………………………………………. 31
16. Transformation ………………………………………………………………………... 34
17. Answers ………………………………………………………………………………. 38
CAUTIONS: NO PART OF THIS PAMPHLET MAY BE REPRODUCED WITHOUT A PERSSION OF THE
AUTHORS
ANY ERRORS IN THIS PAMPHLET ARE THE RESPONSIBILTY OF THE AUTHOR
© 2019 All rights Reserved
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 3 of 84
TOPIC 1: ALGEBRA
1. 2018 Oct/Nov Exams
𝑏𝑏−π‘Žπ‘Ž
(a) Simplify
π‘Žπ‘Ž 2 −𝑏𝑏 2
12𝑑𝑑𝑑𝑑 3
(b) Simplify
(c) Express
3
π‘₯π‘₯+1
−
9𝑐𝑐 3 𝑛𝑛
÷
15𝑐𝑐𝑐𝑐 3
4
π‘₯π‘₯−1
10𝑐𝑐 2 𝑑𝑑 2
as a single fraction in its lowest terms.
2. 2018 July/Aug Exams
(a) Simplify
(b) Express
7𝑠𝑠𝑑𝑑 3
3
−
2π‘₯π‘₯−5
5𝑒𝑒 3 𝑣𝑣
×
15𝑒𝑒 3 𝑣𝑣 2
28𝑠𝑠 3 𝑑𝑑 2
4
as a single fraction in its lowest terms.
π‘₯π‘₯−3
3. 2017 Oct/Nov Exams
(a) Simplify
(b) Simplify
(c) Express
14π‘₯π‘₯ 3
7π‘₯π‘₯ 4
÷
9𝑦𝑦 2
18𝑦𝑦 3
2π‘₯π‘₯2 −8
1
π‘₯π‘₯−4
π‘₯π‘₯+2
−
2
5π‘₯π‘₯−1
as a single fraction in its lowest terms.
4. 2017 July/ Aug Exams
(a) Simplify
(b) Simplify
(c) Express
π‘šπ‘š 2 −1
π‘šπ‘š 2 −π‘šπ‘š
𝑝𝑝 2 π‘žπ‘ž 3
3
4
5π‘₯π‘₯−2
−
×
8
𝑝𝑝𝑝𝑝
2
π‘₯π‘₯+3
÷ 2𝑝𝑝2 π‘žπ‘ž
as a single fraction in its lowest terms.
5. 2016 October Exams
(a) Simplify
(b) Simplify
(c) Express
π‘₯π‘₯−1
π‘₯π‘₯ 2 −1
17π‘˜π‘˜ 2
20π‘Žπ‘Ž 2
2
2π‘₯π‘₯−1
÷
−
51π‘˜π‘˜ 2
5π‘Žπ‘Ž
1
3π‘₯π‘₯+1
as a single fraction in its lowest terms.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 4 of 84
TOPIC 2: MATRICES
1. 2018 Oct/Nov Exams, Q1(a)
Given that 𝐴𝐴 = �
8
−5
� and 𝐡𝐡 = �
2
3
4
1
𝑦𝑦
οΏ½,
5
(a) find the value of 𝑦𝑦, for which the determinants of A and B are equal,
(b) hence find the inverse of B.
2. 2018 Jul/August Exams: Q1(a)
2π‘₯π‘₯
3
Given that A = οΏ½
2
οΏ½,
π‘₯π‘₯
(a) find the positive value of π‘₯π‘₯ for the determinant of A is 12,
(b) hence or otherwise find A−1 .
3. 2017 Oct/Nov Exams: Q1(a)
3
Given that matrix M = οΏ½
5
−2
οΏ½
π‘₯π‘₯
(a) find the value of π‘₯π‘₯ for which the determinant of M is 22,
(b) hence find the inverse of M.
4. 2017 July/ Aug Exams: Q1(a)
10
11
Given that K = οΏ½
−2
οΏ½, find
−2
(a) the determinant of K,
(b) the inverse of K.
5. 2016 Oct/Nov Exams: Q1(a)
Given that 𝑄𝑄 = οΏ½
3
π‘₯π‘₯
−2
οΏ½, find
4
(a) the value of π‘₯π‘₯, given that the determinant of Q is 2,
(b) the inverse of Q.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 5 of 84
TOPIC3: SETS
1. 2018 Oct/Nov Exams: Q2(b)
At Sambilileni College, 20 students study at least one of the three subjects; Mathematics
(M), Chemistry (C) and Physics (P). All those who study chemistry also study
mathematics. 3 students study all the three subjects. 4 students study mathematics
only, 8 students study chemistry and 14 students study mathematics.
(i)
Draw a Venn diagram to illustrate the information
(ii)
How many students study
(a) Physics only
(b) two types of subjects only,
(c) Mathematics and physics but not chemistry.
2. 2018 Jul/Aug Exams: Q3(a)
The diagram below shows how learners at Twatenda School travel to school. The
learners use either buses (B), cars (C) or walk (W) to school.
B
E
C
7
2
14
4
π‘₯π‘₯
7
(i)
(ii)
3
W
If 22 learners walk to school, find the value of π‘₯π‘₯.
How many learners use
(a) only one mode of transport,
(b) two different mode of transport.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 6 of 84
3. 2017 Oct/Nov Exams: Q1 (b).
A survey carried out at Kamulima Farming Block showed that 44 farmers planted maize,
32 planted sweet potatoes, 37 planted cassava, 14 planted both maize and sweet
potatoes, 24 planted both sweet potatoes and cassava, 20 planted both maize and
cassava, 9 planted all the three crops and 6 did not plant any of these crops.
(i)
Illustrate this information on a Venn diagram.
(ii)
How many farmers
(a) Where at this farming block,
(b) Planted maize only
(c) Planted two different crops
4. 2017 July/Aug Exams: Q3 (b)
The Venn diagram below shows tourist attractions visited by certain students in a
certain week.
(i)
(ii)
Find the value of 𝑦𝑦 if 7 students visited Mambilima Falls only.
How many students visited
(a) Victoria falls but not Gonya Falls,
(b) Two tourist attractions only,
(c) One tourist attraction only?
5. 2016 October Exams,Q2 (a)
Of the 50 villagers who can tune in to Kambani Radio Station,29 listen to news,25 listen
to sports, 22 listen to music, 11 listen to both news and sports,9 listen to both sports
and music,12 listen to both news and music,4 listen to all the three programmes and 2
do not listen to any programme.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 7 of 84
(i)
Draw a Venn diagram to illustrate this information.
(ii)
How many villagers
(a) Listen to music only,
(b) Listen to one type of programme only,
(c) Listen to two types of programs only.
TOPIC 4: PROBABILITY
1. 2018 Oct/Nov Exams, Q1(b)
A small bag contains 6 black and 9 red pens of the same type. Two pens are taken at
random one after the other without replacement. Calculate the probability that both
pens
(a) One is black,
(b) are of different colour.
2. 2018 Jul/Aug Exams, Q5 (a)
A box contains identical buttons of different colours. There are 20 black, 12 red and 4
white buttons in the box. Two buttons are picked at random one after the other and not
replaced in the box.
(a) Draw a tree diagram to show all the possible outcomes.
(b) What is the probability that both buttons are white?
3. 2017 Oct/Nov Exams, Q2 (a)
A box of chalk contains 5 white, 4 blue and 3 yellow pieces of chalk. A piece of chalk is
selected at random from the box and not replaced. A second piece of chalk is then
selected.
(a) Draw a tree diagram to show all the possible outcomes.
(b) Find the probability of selecting pieces of chalk of the same colour.
4. 2017 July Exams, Q3 (a)
In a box of 10 bulbs, 3 are faulty. If two bulbs are drawn at random one after the other,
find the probability that
(a)
Both are good.
(b)
One is faulty and the other one is good.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 8 of 84
5. 2016 Oct/Nov Exams, Q2 (b)
A survey was carried out at certain hospital indicated that the probability that patient
tested positive for malaria is 0.6. What is the probability that two patients selected at
random
(a)
one tested negative while the other positive,
(b)
both patients tested negative.
TOPIC 5: SEQUENCES AND SERIES
1. 2018 Oct/Nov Exams, Q5(b)
The first three terms of a geometric progression are π‘˜π‘˜ + 4, π‘˜π‘˜ π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž 2π‘˜π‘˜ − 15 where π‘˜π‘˜ a
positive integer.
(a) find the value of π‘˜π‘˜,
(b) list the first three terms of the geometric progression,
(c) find the sum to infinity.
2. 2018 Jul/Aug Exams, Q2(b)
2
In a geometric progression, the third term is and the fourth term is
(a) The first term and the common ratio,
9
2
27
. Find
(b) The sum of the first 5 terms of the geometric progression,
(c) The sum to infinity.
3. 2017 Oct/Nov Exams, Q5(a)
1
For the geometric progression 20, 5,1 , . . . , find
(a) the common ratio,
4
(b) the nth term,
(c) the sum of the first 8 terms.
4. 2017 July/ Aug Exams, Q2(b)
The first three terms of a geometric progression are 6 + 𝑛𝑛, 10 + 𝑛𝑛 and 15 + 𝑛𝑛. Find
(a) the value of n,
(b) the common ratio,
(c) the sum of the first 6 terms of this sequence.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 9 of 84
5. 2016 Oct/Nov Exams, 5(b)
The first three terms of a geometric progression are π‘₯π‘₯ + 1, π‘₯π‘₯ − 3 and π‘₯π‘₯ − 1.
(a)
the value of π‘₯π‘₯,
(b)
the first term,
(c)
the sum to infinity.
TOPIC 6: PSEUDO CODE AND FLOW CHARTS
1. 2018 Oct/Nov Exams, Q6(b)
The program below is given in a form of a Pseudo code
Start
Enter π‘₯π‘₯, 𝑦𝑦
Let M = square root(π‘₯π‘₯ squared + 𝑦𝑦 squared)
IF M< 0
THEN display error message “ M must be positive”
ELSE
END IF
Display M
Stop
Draw the corresponding flow chart for the information given above.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 10 of 84
2. 2018 July/Aug Exams, Q5(b)
Study the pseudo code below.
Start
Enter π‘Žπ‘Ž, π‘Ÿπ‘Ÿ, 𝑛𝑛
R= 1 − π‘Ÿπ‘Ÿ
If R = 0 THEN
Print “the value of r is not valid”
Else Sn =
End if
π‘Žπ‘Ž(1−π‘Ÿπ‘Ÿ 𝑛𝑛 )
R
Print Sn
Stop
Construct a flow chart corresponding to the Pseudo code above.
3. 2017 Oct/Nov Exams, Q6
Study the flow chart below
Start
Enter r
Is
r < 0?
Yes
Error “r must be positive”
No
1
𝐴𝐴 = ∗ π‘Ÿπ‘Ÿ ∗ π‘Ÿπ‘Ÿ ∗ 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
2
Display Area
Stop
Write a pseudo code corresponding to the flow chart program above
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 11 of 84
4. 2017 July/Aug Exams, Q6(b)
The diagram below is given in the form of a flow chart
Start
Enter a, r
Is
|𝒓𝒓| < 1?
No
Yes
𝑺𝑺∞ =
𝒂𝒂
𝟏𝟏− 𝒓𝒓
Display sum to infinity
Stop
Write a pseudo code corresponding to the flow chart program above
5. 2016 Oct/Nov Exams, Q3(b)
The program below is given in the form of a pseudo code.
Start
Enter radius
If radius < 0
The display “error message” and re-enter positive radius
Else enter height
If height < 0
The display “error message” and re-enter positive height
1
Else Volume = ∗ πœ‹πœ‹ ∗ square radius ∗ height
3
End if
Display volume
Stop
Draw the corresponding flowchart for the information given above.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 12 of 84
TOPIC 7: LOCI & CONSTRUCTION
Answer the whole of these questions on a sheet of plain papers
1. 2018 Oct/Nov Exams, Q4
(a)
(i)
(ii)
(b)
(c)
Construct triangle XYZ in which XY = 9cm, YZ = 7cm and angle XYZ = 38°
Measure and write the length of XZ
On your diagram within triangle XYZ, construct the locus of points which are
(i)
6cm from Y
(ii)
equidistant from XY and XZ
Mark clearly with letter P, within triangle XYZ, a point which is 6cm from Y and
equidistance from XY and XZ.
(d)
A point Q within triangle XYZ is such that its distance from Y is less than or equal
to 6cm and its nearer to XY than XZ. Indicate clearly by shading the region in
which Q must lie.
2. 2018 Jul/Aug Exams, Q4
(a)
(i)
(ii)
(b)
(c)
οΏ½ R = 50°
Construct triangle PQR in which PQ = 10cm, QR = 8cm and 𝐏𝐏𝐐𝐐
Measure and write the length of PR
On your diagram, within triangle PQR, construct the locus of points which are
(i)
equidistant from P and Q
(ii)
equidistant from PR and PQ
(iii)
5cm from R
A point T within triangle PQR is such that it is 5cm from R and equidistant from P
and Q. Label point T.
(d)
Another point X is such that it is less than or equal to 5cm from R, nearer to Q
than P and nearer to PQ than PR. Indicate by shading, the region in which X must
lie.
3. 2017 Oct/Nov Exams, Q3
(a)
Construct a quadrilateral ABCD in which AB = 10cm, and angle ABC = 120°, angle
BAD = 60°, BC = 7cm and AD = 11cm
(b)
Measure and write the length of CD
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 13 of 84
(c)
(d)
Within the quadrilateral ABCD, draw the locus of points which are
(i)
8cm from A
(ii)
Equidistant from BC and CD
A point P, within the quadrilateral ABCD, is such that it 8cm from A and
equidistant from BC and CD. Label point P.
(e)
Another point Q, within the quadrilateral ABCD, is such that, it is nearer to CD
than BC and greater than or equal to 8cm from A. indicate, by shading, the
region in which Q must lie.
4. 2017 July/Aug Exams, Q4
(a)
(i)
(ii)
(b)
(c)
Construct triangle PQR in which PQ is 9cm, angle PQR = 60° and QR = 10cm
Measure and write the length of PR.
On your diagram, draw the locus of points with triangle PQR which are
(i)
3cm from PQ,
(ii)
7cm from R,
(iii)
Equidistant from P and R.
A point M, within triangle PQR, is such that it is nearer to R than P, less than or
equal to 7cm from R and less than or equal to 3cm from PQ. Shade the region in
which M must lie
5. 2016 Oct/Nov Exams, Q4
(a)
(b)
(c)
(i)
Construct triangle ABC where AB = BC = CA = 7cm
(ii)
Measure and write the size of ∠CAB.
Within triangle ABC construct the locus of points which are
(i)
Equidistant from AB and BC
(ii)
4cm from B
(iii)
3cm from AB
A point R, within triangle ABC, is such that it is nearer to BC than AB, less that
3cm from AB and less than 4cm from B. Shade the region in which R must lie.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 14 of 84
TOPIC 8: CALCULUS
1. 2018 Oct/Nov Exams, Q3
2
(a) Evaluate ∫−1(2 + π‘₯π‘₯ − π‘₯π‘₯ 2 )𝑑𝑑𝑑𝑑
(b) Find the equation of the normal to the curve 𝑦𝑦 = π‘₯π‘₯ +
2. 2018 Jul/Aug Exams, Q7(b)
1
(a) Evaluate ∫0 (π‘₯π‘₯ 2 − 2π‘₯π‘₯ + 3)𝑑𝑑𝑑𝑑
4
π‘₯π‘₯
at the point where π‘₯π‘₯ = 4
(b) Determine the equation of the normal to the curve 𝑦𝑦 = 2π‘₯π‘₯ 2 − 3π‘₯π‘₯ − 2 that passes
through (3, 7)
3. 2017 Oct/Nov Exams, Q9 (b & c)
(a) Find the coordinates of the points on the curve 𝑦𝑦 = 2π‘₯π‘₯ 3 − 3π‘₯π‘₯ 2 − 36π‘₯π‘₯ − 3 where
the gradient is zero.
3
(b) Evaluate ∫−1(3π‘₯π‘₯ 2 − 2π‘₯π‘₯)𝑑𝑑𝑑𝑑
4. 2017 July/Aug Exams, Q4b & 9c
5
(a) Evaluate ∫2 (3π‘₯π‘₯ 2 + 2)𝑑𝑑𝑑𝑑
(b) Find the equation of the tangent to the curve 𝑦𝑦 = π‘₯π‘₯ 2 − 3π‘₯π‘₯ − 4 at a point where
π‘₯π‘₯ = 2
5. 2016 Oct / Nov Exams, Q6
3
The equation of the curve is𝑦𝑦 = π‘₯π‘₯ 3 − π‘₯π‘₯ 2 . Find
2
(a) equation of the normal where π‘₯π‘₯ = 2,
(b) the coordinates of the stationary points.
Continue working hard, Rome was not built in one day
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 15 of 84
TOPIC 9: VECTORS
1. 2018 Oct/Nov Exams, Q3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = π‘Žπ‘Ž and οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
AD = b, οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
BC = 2𝑏𝑏 and AE: AC = 1: 3
In the quadrilateral ABCD, AB
U
(i)
(ii)
Find in terms of π‘Žπ‘Ž and/or 𝑏𝑏
(a) οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴
(b) οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡
U
(c) οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡
Hence or otherwise show that the points B, D and E are collinear
2. 2017 Oct/Nov Exams, Q2(b)
�����⃑ = 2p, �����⃑
In the diagram below, OP
OQ = 4q and PX ∢ XQ = 1: 2
(i)
(ii)
Express in terms of p and / or q.
(a) οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
PQ
οΏ½οΏ½οΏ½οΏ½βƒ—
(b) PX
(c) οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OX
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—, show that CQ
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 4 οΏ½1 − β„Ž οΏ½q − 4β„Ž p.
Given that οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OC = β„ŽOX
3
3
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 16 of 84
3. 2017 July/Aug Exams, Q6(a)
�����⃑ = π‘Žπ‘Ž and������⃑
In the diagram below, OABC is a parallelogram in which OA
AB = 2𝑏𝑏. OB and
AC intersect at D. E is the midpoint of CD. E is the mid - point of CD.
U
Express in terms of a and / or b.
�����⃑,
OB
�����⃑
OE,
(a)
(b)
�����⃑
CD.
(c)
4. 2017 Oct/Nov Exams, Q6(a)
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 3π‘Žπ‘Ž and 𝑂𝑂𝑂𝑂
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 6𝑏𝑏 .
In the diagram below, OAB is a triangle in which 𝑂𝑂𝑂𝑂
U
U
OC : CA = 2 : 3 and AD : DB = 1 : 2. OD meets CB at E.
(i)
Express each of the following in terms of π‘Žπ‘Ž and / or 𝑏𝑏
U
(a) οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
AB
OD
(b) οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
(c)
(ii)
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
BC
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—, express BE
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = hBC
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— in terms of β„Ž, π‘Žπ‘Ž and 𝑏𝑏
Given that BE
Compiled and Solved by Kachama Dickson C & Chansa John
U
/ Together we can do Mathematics /0966-295655
Page 17 of 84
TOPIC10: TRIGONOMETRY
1. 2018 Oct/Nov Exams, Q8
In the diagram below, K, N, B and R are places on horizontal surface. KN = 80m,
οΏ½ N = 52°
NB = 50m and KR
80m
K
60°
N
50m
B
52°
(a) Calculate
R
(i)
KR
(ii)
the area of triangle KNB
(b) Given that the area of triangle KNR is equal to 3 260π‘šπ‘š2 , calculate the shortest
distance from R to KN.
(c) Sketch the graph of 𝑦𝑦 = cos πœƒπœƒ 𝑓𝑓𝑓𝑓𝑓𝑓 0° ≤ πœƒπœƒ ≤ 360°
2. 2018 July/Aug Exams, Q8
(a) Three villages A, B and C are connected by straight paths as shown in the diagram
below.
A
15km
B
79°
40°
C
Given that AB = 15km, angle ABC = 79° and angle ACB = 40°, calculate the
(i) Distance AC (ii) area of triangle ABC (iii) shortest distance from B to AC
(b) Solve the equation cos πœƒπœƒ = 0.937 for 𝑓𝑓𝑓𝑓𝑓𝑓 0° ≤ πœƒπœƒ ≤ 360°
(c) Sketch the graph of 𝑦𝑦 = sin πœƒπœƒ 𝑓𝑓𝑓𝑓𝑓𝑓 0° ≤ πœƒπœƒ ≤ 360°
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 18 of 84
3. 2017 Oct/Nov Exams, Q7
(a) The diagram below shows the Location of houses for a village Headman (H), his
Secretary (S) and a Trustee (T). H is 1.3 km from S, T is 1.9 km from H and
οΏ½ S = 130°
TH
Calculate
(i)
the area of triangle THS
(ii)
the distance TS
(iii)
the shortest distance from H to TS
(b) Find the angle between 0° and 90° which satisfies the equation cos πœƒπœƒ =
4. 2017 July/ Aug Exams, Q10
2
3
(a) In Triangle PQR below, QR = 36.5, angle PQR = 36° and angle QPR = 46°.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 19 of 84
Calculate
(i)
PQ
(ii)
the area of triangle PQR
(iii)
the shortest distance from R to PQ
(b) Solve the equation sin θ = 0.6792 for 0° ≤ θ ≤ 360°
5. 2016 Oct/Nov Exams, Q10
(a) The diagram below shows the location of three secondary schools, namely Mufulira
(M), Kantanshi (K) and Ipusukilo (I) in Mufulira district. M is 5km from K, I is 3km
from K and angle MKI is 110°
Calculate
(i)
MI
(ii)
the area of triangle MKI
(iii)
the shortest distance from K to MI
(b) Solve the equation tan θ = 0.7 for 0° ≤ θ ≤ 180°.
Don’t wait for somebody to tell you that you can do it, just believe in yourself that you can do it
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 20 of 84
TOPIC 11: MENSURATION
1. 2018 Oct/ Nov Exams, Q12(a)
The diagram below is a frustum of a rectangular pyramid with a base 14cm long and
10cm wide. The top of a frustum is 8cm long and 4cm wide.
8cm
4cm
10cm
14cm
Given that the height of the frustum is 11.4cm, calculate its volume.
2. 2018 July/August Exams, Q6
The diagram below shows a bin in the form of a frustum with square base ends of t sides
4cm and 10cm respectively. The height of the bin is 9cm.
10cm
9cm
4cm
Find the volume of the bin.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 21 of 84
3. 2017 Oct/ Nov Exams, Q4(b)
The figure below is a frustum of a cone. The base diameter and top diameter are 42cm
and 14 cm respectively, while the height is 20cm. (Take𝝅𝝅 = πŸ‘πŸ‘. 𝟏𝟏𝟏𝟏𝟏𝟏)
Calculate its volume
4. 2017 July/Aug Exams, Q12 (a)
The figure below is a cone ABC form which BCXY remained after the small cone AXY was
cut of [Take πœ‹πœ‹ = 3.142]
Given that EX = 4cm, DB = 12cm and DE = 15cm, calculate
(i)
the height AE, of the smaller con AXY.
(ii)
the volume of XBCY, the shape that remained.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 22 of 84
5. 2016 Oct/ Nov Exams; Q 9(b and c)
(a) The cross section of a rectangular tank measures 1.2m by 0.9. if it contains fuel to a
depth of 10m, find the number of litres of fuel in the tank. (1m3 = 1000litres)
(b) A cone has a perpendicular height of 12 cm and slant height of 13 cm, calculate its
total surface area. (Takeπœ‹πœ‹ = 3.142).
TOPIC 12: EARTH GEOMETRY
1. 2018 Oct/Nov Exams, Q12(b)
The points A (15°N, 40°E), B(35°N, 70°E)and C (35°S, 40°E) are on the surface of the
Earth. [Use 𝝅𝝅 = πŸ‘πŸ‘. 𝟏𝟏𝟏𝟏𝟏𝟏 𝐚𝐚𝐚𝐚𝐚𝐚 𝑹𝑹 = πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”]
(a) Calculate the distance AC in kilometers.
(b) An aero plane takes off from point B and flies due west on the same latitude
covering a distance of 900km to point Q.
(i)
Calculate the difference in longitudes between B and Q.
(ii)
Find the position of Q.
2. 2018 July/ Aug Exams, Q7(a)
In the diagram below, A and B are points on latitude 60°N while C is a point on latitude
60°S. [ πœ‹πœ‹ = 3.142 and R = 3437nm].
(a) Calculate the distance BC along the latitude 60°πΈπΈ in nautical miles.
(b) A ship sails from C to D in 12 hours. Find its speed in notes.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 23 of 84
3. 2017 Oct/ Nov Exams, Q9(a)
W, X, Y and Z are four points on the surface of the earth as shown in the diagram below.
(Take 𝛑𝛑 = πŸ‘πŸ‘. 𝟏𝟏𝟏𝟏𝟏𝟏 𝐚𝐚𝐚𝐚𝐚𝐚 𝐑𝐑 = πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘)
(a) Calculate the difference in latitudes between W and Y.
(b) Calculate the distance in nautical miles between
(i)
X and Z along the longitudes 105°E
(ii)
Y and Z along the circle of latitude 30°S
4. 2017 July/Aug Exams, Q12 (a)
P (80°N, 10°E), 𝐐𝐐(80°N, 70°E), 𝐑𝐑(85°S, 70°E)and 𝐒𝐒(85°S, 10°E) are the points on the
surface of the earth.
(i)
Show the points on a clearly labeled sketch of the surface of the earth
(ii)
Find in nautical miles
(a) The distance QR along the longitude,
(b) The circumference of latitude 85°S.
[Take 𝛑𝛑 = πŸ‘πŸ‘. 𝟏𝟏𝟏𝟏𝟏𝟏 𝐚𝐚𝐚𝐚𝐚𝐚 𝐑𝐑 = πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘]
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 24 of 84
5. 2016 Oct/ Nov Exams, Q9(a)
The points A, B, C and D are on the surface of the earth.
(Take π = 3.142 and R = 3437nm)
(a)
(b)
(c)
Find the difference in latitude between points C and B.
Calculate the length of the circle of latitude 50°N in nautical miles.
Find the distance AD in nautical miles.
TOPIC 13: QUADRATIC FUNCTIONS
1. 2018 Oct/Nov Exams, Q7(a)
The values π‘₯π‘₯ and 𝑦𝑦 are connected by the equation𝑦𝑦 = 2π‘₯π‘₯ 3 − 3π‘₯π‘₯ 2 + 5. Some
corresponding values of π‘₯π‘₯ and 𝑦𝑦 are given in the table below.
π‘₯π‘₯
−2
−1.5
−1
−0.5
0
0.5
1
1.5
2
𝑦𝑦
𝑝𝑝
−8.5
(a) Calculate the value of P
0
4
5
4.5
4
5
9
(b) Using a scale of 4cm to represent 1 unit on the π‘₯π‘₯ −axis for −2 ≤ π‘₯π‘₯ ≤ 2 and a scale
of 2cm to represent 5 units on the 𝑦𝑦 −axis for−25 ≤ 𝑦𝑦 ≤ 10, draw the graph
of 𝑦𝑦 = 2π‘₯π‘₯ 3 − 3π‘₯π‘₯ 2 + 5.
(c) Use your graph to solve the equation 2π‘₯π‘₯ 3 − 3π‘₯π‘₯ 2 + 5 = π‘₯π‘₯
(d) Calculate an estimate of the gradient of the curve at the point where π‘₯π‘₯ = 1.5
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 25 of 84
2. 2018 July/ Aug Exams, Q12a)
The diagram below shows the graph of 𝑦𝑦 = π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 12π‘₯π‘₯
(a) Use the graph to solve the equation
(i)
π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 12π‘₯π‘₯ = 0
(ii)
π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 12π‘₯π‘₯ = π‘₯π‘₯ + 10
(b) Calculate an estimate of the
(i)
Gradient of the curve at the point where π‘₯π‘₯ = −3
(ii)
Area bounded by the curve, π‘₯π‘₯ = −3, π‘₯π‘₯ = −1 and 𝑦𝑦 = −10
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 26 of 84
3. 2017 Oct / Nov Exams, Q10(a)
The diagram below shows the graph of 𝑦𝑦 = π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3
(a) Use the graph to find the solutions of the equations
(i)
π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3 = 0
(ii)
π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3 = 5
(b) Calculate an estimate of
(i)
the gradient of the curve at the point (−3,0)
(ii)
the area bounded by the curve, π‘₯π‘₯ = 0, 𝑦𝑦 = 0 and 𝑦𝑦 = 20
I was not born a mathematician, but I am determined to
Be a mathematician (Young Prof)
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 27 of 84
4. 2017 July/Aug Exams, Q9(a)
The diagram below shows the graph of 𝑦𝑦 = π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 5π‘₯π‘₯ + 3
Use the graph
(a) to calculate an estimate of the gradient of the curve at the point (2,5).
(b) to solve the equations
(i)
π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 5π‘₯π‘₯ + 3 = 0
(ii)
π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 5π‘₯π‘₯ + 3 = 5π‘₯π‘₯
(c) to calculate an estimate of the area bounded by the curve π‘₯π‘₯ = 0, 𝑦𝑦 = 0 and π‘₯π‘₯ = −2
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 28 of 84
5. 2016 Oct/ Nov Exams, Q9(a)
The values of x and y are connected by the equation 𝑦𝑦 = π‘₯π‘₯(π‘₯π‘₯ − 2)(π‘₯π‘₯ + 2). Some
corresponding values of x and y are given in the table below
π‘₯π‘₯
𝑦𝑦
−3
−15
−2
(a) Calculate value of π‘˜π‘˜
0
−1
3
0
0
1
−3
2
0
3
π‘˜π‘˜
(b) Using a scale of 2cm to represent 1 unit on the x – axis for −3 ≤ π‘₯π‘₯ ≤ 3 and 2cm to
represent 5 units on the y- axis for−16 ≤ 𝑦𝑦 ≤ 16. Draw the graph of
𝑦𝑦 = π‘₯π‘₯(π‘₯π‘₯ − 2)(π‘₯π‘₯ + 2)
(c) Use your graph to solve the equations
(i)
(ii)
π‘₯π‘₯(π‘₯π‘₯ − 2)(π‘₯π‘₯ + 2) = 0
π‘₯π‘₯(π‘₯π‘₯ − 2)(π‘₯π‘₯ + 2) = π‘₯π‘₯ + 2
TOPIC 14: LINEAR PROGRAMING
All the questions in this topic are to be answered on the sheet of graph papers.
1. 2018 Oct/Nov Exams, Q7(a)
A hired bus is used to take learners and teachers on a trip. The number of learners and
teachers must be more than 60. There must be at least 35 people on the trip. There
must be at least 6 teachers on the trip. The number of teachers on the trip should not
be more than 14.
Let π‘₯π‘₯ be the number of learners and 𝑦𝑦 be the number of teachers.
(a) Write four inequalities which present the information above.
(b) Using a scale of 2cm to represent 10 units on both axes, draw the x and y axes for
0 ≤ π‘₯π‘₯ ≤ 70 π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž 0 ≤ 𝑦𝑦 ≤ 70 respectively and shade the unwanted region to
indicate clearly where the solution of the inequalities lie.
(c) (i)
If the group has 25 learners, what is the minimum number of teachers that
must accompany them?
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 29 of 84
(ii)
If 8 teachers go on the trip, what is the maximum number of learners that
can be accommodated on the bus?
(d) If T is the amount in Kwacha paid by the whole group, what is the cost per learner if
T = 30π‘₯π‘₯ + 50𝑦𝑦
2. 2018 July/ Aug Exams, Q12a)
A tailor at a certain market intends to make dresses and suits for sale.
(a) Let π‘₯π‘₯ represent the number of dresses and 𝑦𝑦 the number of suits. Write the
inequalities which represent each of the conditions below.
(i)
The number of dresses should not exceed 50
(ii)
The number of dresses should not be more than the number of suits.
(iii)
The cost of making a dress is K140.00 and that o a suit is K210.00. The total
should be at least K10 500.00
(b)
Using a scale of 2cm to represent 10 units on both axes, draw π‘₯π‘₯ and 𝑦𝑦 axes for
0 ≤ π‘₯π‘₯ ≤ 60 and 0 ≤ 𝑦𝑦 ≤ 80. Shade the unwanted region to indicate clearly the
region where (π‘₯π‘₯, 𝑦𝑦) must lie.
(c) (i) The profit on a dress is K160.00 and on a suit is K270.00. Find the number of
dresses and suits the tailor must make for maximum profit.
(ii) Calculate this maximum profit.
3. 2017 Oct / Nov Exams, Q10(a)
Himakwebo orders maize and groundnuts for sale. The order price for a bag of maize is
K75.00 and that of a bag of groundnuts is K150.00. He is ready to spend up to K7 500.00
altogether. He intends to order at least 5 bags of maize and at least 10 bags of
groundnuts. He does not want to order more than 70 bags altogether.
(a)
If π‘₯π‘₯ and 𝑦𝑦 are the number of bags of maize and groundnuts respectively,
Write four inequalities which represent these conditions.
(b)
Using a scale of 2cm to represent 10 bags on each axis, draw the x and y axes for
0 ≤ π‘₯π‘₯ ≤ 70 π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž 0 ≤ 𝑦𝑦 ≤ 70 respectively and shade the unwanted region to
show clearly the region where the solution of the inequalities lie.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 30 of 84
(c)
Given that a profit on the bag of maize is K25.00 and on the bag of groundnuts is
K50.00, how many bags of each type should he order to have the maximum
profit?
(d)
What is this estimate of the maximum profit?
4. 2017 July/Aug Exams, Q9(a)
Makwebo prepares two types of sausages, hungarian and beef, daily for sale. She
prepares at least 40 hungarian and at least 10 beef sausages. She prepares not more
than 160 sausages altogether. The number o beef sausages prepared are not more than
the number of Hungarian sausages.
(a)
Given that x represents the number of Hungarian sausages and y the number of
beef sausages, write four inequalities which represent these conditions.
(b)
Using a scale of 2cm to present 20cm sausages on both axes, draw the x and y
axes for 0 ≤ π‘₯π‘₯ ≤ 160 and 0 ≤ 𝑦𝑦 ≤ 160 respectively and shade the unwanted
region to show clearly the region where the solution of the inequalities lie.
(c)
The profit on the sale of each Hungarian sausage is K3.00 and on each beef
sausage is K2.00. How many of each type of sausages are required to make
maximum profit?
(d)
Calculate this maximum profit
5. 2016 Oct/ Nov Exams, 11(a)
A Health Lobby group produced a guide to encourage healthy living among local
community. The group produced the guide in two formats: a short video and a printed
book. The group needs to decide the number of each format to produce for sale to
maximize profit.
Let π‘₯π‘₯ represent the number of videos produced and 𝑦𝑦 the number of printed books
produced.
(a)
Write the inequalities which represent each of the following conditions
(i)
the total number of copies produced should not be more than 800,
(ii)
the number of video copies to be at least 100
(iii)
the number of printed books to be at least 100.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 31 of 84
(b)
Using a scale of 2cm to represent 100 copies on both axes, draw the x and y
axes for 0 ≤ π‘₯π‘₯ ≤ 800 π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž 0 ≤ 𝑦𝑦 ≤ 800 respectively and shade the
unwanted region to indicate clearly the region where the solution of the
inequalities lie.
(c)
The profit on the sale of each video copy is K15.00 while the profit on each
printed book is K8.00. How many of each type were produced to make
maximum profit
TOPIC 15: STATISTICS
1. 2018 Oct/Nov Exams, Q9
The frequency table below shows the distribution of marks obtained by 90 learners on a
test.
10 < π‘₯π‘₯ ≤ 20
20 < π‘₯π‘₯ ≤ 30
30 < π‘₯π‘₯ ≤ 40
40 < π‘₯π‘₯ ≤ 50
50 < π‘₯π‘₯ ≤ 60
60 < π‘₯π‘₯ ≤ 70
Marks(x)
frequency
2
10
15
23
30
10
(a) Calculate the standard deviation
(b) Answer this part of this question on the sheet of graph paper
(i)
copy and complete the cumulative frequency table
Marks(x)
Cumulative frequency
Relative Cumulative frequency
(ii)
(iii)
≤ 10
0
0
≤ 20
2
0.02
≤ 30
12
0.13
≤ 40
27
0.3
≤ 50
50
≤ 60
80
≤ 70
90
Using a scale of 2cm to represent 10 units on the x- axis for 0 ≤ π‘₯π‘₯ ≤ 70 and a
scale of 2cm to represent 0.1 units on the y – axis for 0 ≤ 𝑦𝑦 ≤ 1, draw a
smooth relative cumulative frequency curve.
Showing your method clearly, use your graph to estimate the 65th Percentile.
2. 2018 July/ Aug Exams, Q11
A farmer planted 60 fruit trees. In a certain month, the number of fruits per tree was
recorded and the results were as shown in the table below.
Fruits per tree
frequency
2
1
3
4
5
6
7
8
5
4
6
10
16
18
(a) Calculate the standard deviation
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 32 of 84
(b) Answer this part of the question on the sheet of graph paper
(i)
Using the table above, copy and complete the relative cumulative frequency
table below
(ii)
Fruits per tree
2
3
4
5
6
7
8
Cumulative frequency
1
6
10
16
26
42
60
Relative cumulative frequency
0.02
0.1
0.17
0.27
Using a scale of 1cm to represent 1 unit on the x-axis for 0 ≤ π‘₯π‘₯ ≤ 8 and a
scale of 2cm to represent 0. 1 unit on the y – axis for 0 ≤ 𝑦𝑦 ≤ 1, draw a
smooth relative frequency curve.
(iii)
Showing your method clearly, use your graph to estimate the 70th Percentile.
3. 2017 Oct / Nov Exams, Q8
The table below shows the amount of money spent by 100 learners at school on a
particular day.
Amount in Kwacha
Frequency
0 < π‘₯π‘₯ ≤ 5
13
5 < π‘₯π‘₯ ≤ 10
27
0 < π‘₯π‘₯ ≤ 15
35
15 < π‘₯π‘₯ ≤ 20
16
20 < π‘₯π‘₯ ≤ 25 2 25 ≤ π‘₯π‘₯ ≤ 30
7
2
(a) Calculate the standard deviation.
(b) Answer this part of the question on a sheet of graph paper
(i)
Using the table above, copy and complete the cumulative frequency table
below.
Amount in
Kwacha
Cumulative frequency
(ii)
≤0
0
≤5
13
≤ 10
≤ 15
≤ 20
40
≤ 25
≤ 30
100
Using a scale of 2cm to represent 5 units on the horizontal axis and 2cm to
represent 10 units on the vertical axis, draw a smooth cumulative frequency
curve.
(iii)
Showing your method clearly, use your graph to estimate the
semi− interquartile range.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 33 of 84
4. 2017 July/ Aug Exams, Q8
The frequency table below shows the number of copies of newspapers allocated to 48
newspaper vendors.
Copies of
Newspaper
Number of
vendors
25 < π‘₯π‘₯ ≤ 30
6
30 < π‘₯π‘₯ ≤ 35
4
35 < π‘₯π‘₯ ≤ 40
40 < π‘₯π‘₯ ≤ 45
7
11
45 < π‘₯π‘₯ ≤ 50
12
50 < π‘₯π‘₯ ≤ 55
8
55 < π‘₯π‘₯ ≤ 60
1
(a) Calculate the standard deviation.
(b) Answer this part of the question on a sheet of graph paper
(i)
Using the table above, copy and complete the cumulative frequency table
below.
Copies of
newspaper
Number of
Vendors
(ii)
≤ 25
≤ 30
0
5
≤ 35
9
≤ 40
16
≤ 45
27
≤ 50
≤ 55
≤ 60
Using a horizontal scale of 2cm to represent 10 newspapers on the x –axis for
0 ≤ π‘₯π‘₯ ≤ 60 and a vertical scale of 4cm to represent 10 vendors on the y –
(iii)
axis for 0 ≤ 𝑦𝑦 ≤ 50, draw a smooth cumulative frequency curve.
Showing your method clearly, use your graph to estimate the 50th Percentile.
5. 2016 Oct/ Nov Exams, 7
The ages of people living at Pamodzi Village are recorded in the frequency table below.
0 < π‘₯π‘₯ ≤ 10 10 < π‘₯π‘₯ ≤ 20
20 < π‘₯π‘₯ ≤ 30
30 < π‘₯π‘₯ ≤ 40
40 < π‘₯π‘₯ ≤ 50
50 < π‘₯π‘₯ ≤ 60
Ages
Number of
7
22
28
23
15
5
People
(a) Calculate the standard deviation
(b) Answer part of this question on a sheet of a graph paper
(i)
Using the table above, copy and complete the cumulative frequency table
below.
Age
Number of people
(ii)
≤ 10
7
≤ 20
29
≤ 30
≤ 40
≤ 50
≤ 60
100
Using the scale of 2cm to represent 10 units on both axes, draw a smooth
cumulative frequency curve where 0 ≤ π‘₯π‘₯ ≤ 60 and 0 ≤ 𝑦𝑦 ≤ 100.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 34 of 84
(iii)
Showing your method clearly, use your graph to estimate the
Semi− interquartile range.
TOPIC 16: TRANSFORMATION
1. 2018 Oct/Nov Exams, Q10
Study the diagram below and answer the questions that follow.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 35 of 84
(a)
Triangle R is the image of triangle P under a rotation. Find the coordinates of the
centre, angle and the direction of the rotation.
(b)
A single transformation maps triangle P onto triangle M. describe fully this
transformation.
(c)
Triangle P maps onto triangle V by a stretch. Find the matrix of this
transformation
(d)
If triangle P is mapped onto triangle S by a shear represented by the matrix
1
−2
οΏ½
0
οΏ½, find the coordinates of S.
1
2. 2018 July/Aug Exams, Q10
Using a scale of 1cm to represent 1 unit, on both axes, draw x and y axes for
−8 ≤ π‘₯π‘₯ ≤ 12 π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž − 6 ≤ 𝑦𝑦 ≤ 14.
(a)
(b)
Draw and label triangle X with vertices (2,4), (4,4) and (4,1).
Triangle X is mapped onto triangle U with vertices (6,12), (12,12) and (12,3) by
a single transformation.
(c)
(i)
Draw and label triangle U.
(ii)
Describe fully this transformation.
A 90° clockwise rotation about the origin maps triangle X onto triangle W. Draw
and label triangle W.
(d)
A shear with X –axis as the invariant line and shear factor -2 maps triangle X onto
triangle S. Draw and label triangle S.
(e)
Triangle X is mapped onto triangle M with vertices (4,4), (8,4) and (8,1).
(i)
Draw and label triangle M
(ii)
Find the matrix which represents this transformation
3. 2017 Oct/Nov Exams, Q12
Using a scale of 1cm to represent 1 unit on each axis, draw x and y axes for
−6 ≤ π‘₯π‘₯ ≤ 10 and −10 ≤ 𝑦𝑦 ≤ 8.
(a) A quadrilateral ABCD has vertices A(−5,7), B(−4,8), C(−3,7) and
D(−4,4) while
its imagine has vertices A1 (−5, −3), B1 (−6, −2), C1 (−5, −1) and D1 (−2, −2).
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 36 of 84
(i)
(ii)
(b)
Draw and label the quadrilateral ABCD and its image A1 B1 C1 D1 .
Describe fully the transformation which maps the quadrilateral ABCD
onto quadrilateral A1 B1 C1 D1 .
A2 B2 C2 D2
(i)
(ii)
(c)
−2 0
οΏ½ maps the quadrilateral ABCD on the quadrilateral
0 1
The matrix οΏ½
Find the coordinates of the vertices of the quadrilateral A2 B2 C2 D2
Draw and label the quadrilateral A2 B2 C2 D2 .
The quadrilateral ABCD is mapped onto quadrilateral A3 B3 C3 D3 where
A3 is (4, −8), B3 is (2, −10), is C3 (0, −8)and D3 is (2. −2). Describe fully this
transformation.
4. 2017 July/Aug Exams, Q7
Using a scale of 1cm to represent 1 unit on each axis, draw x and y axes for
−6 ≤ π‘₯π‘₯ ≤ 10 and −6 ≤ 𝑦𝑦 ≤ 12.
(a)
A quadrilateral ABCD has vertices A(1,1), B(2,1), C(3,2) and D(2,3) while
its imagine has vertices 𝐴𝐴1 (3,2), 𝐡𝐡1 (6,1), 𝐢𝐢1 (9,2)
(i)
(ii)
(b)
Draw and label the quadrilateral ABCD and its image A1 B1 C1 D1 .
Describe fully the transformation which maps the quadrilateral ABCD
onto quadrilateral A1 B1 C1 D1 .
The matrix οΏ½
A2 B2 C2 D2 .
(i)
(ii)
(c)
and 𝐷𝐷1 (6,3).
1
3
0
οΏ½ maps the quadrilateral ABCD on the quadrilateral
1
Find the coordinates of quadrilateral A2 B2 C2 D2 .
Draw and label quadrilateral A2 B2 C2 D2 .
Quadrilateral A3 B3 C3 D3 has vertices A3 (−2, −4), B3 (−4, −2), C3 (−6, −4) and
D3 (−4, −6). Describe fully the transformation which maps quadrilateral ABCD
onto A3 B3 C3 D3 .
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 37 of 84
5. 2017 Oct/Nov Exams, Q12
Study the diagram below and answer questions that follow.
(a)
(b)
An enlargement maps triangle ABC onto triangle A1 B1 C1 . Find
(i)
the centre of enlargement
(ii)
the scale factor
Triangle ABC is mapped onto triangle A2 B2 C2 by a shear. Find the matrix which
presents this transformation.
(c)
Triangle ABC is mapped onto triangle A3 B3 C3 by a single transformation.
Describe this transformation fully.
(d)
−3
A transformation with matrix οΏ½
0
not drawn on the diagram. Find
0
οΏ½ maps triangle ABC onto triangle A4 B4 C4
1
(i)
The scale factor of this transformation
(ii)
The coordinates of A4, B4 and C4 .
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 38 of 84
Answers to All the Topic Questions
TOPIC1: ALGEBRA
𝑏𝑏−π‘Žπ‘Ž
1. (a)
π‘Žπ‘Ž 2 −𝑏𝑏 2
=
=
2. (a)
−𝟏𝟏
7𝑠𝑠𝑑𝑑 3
15𝑒𝑒 3 𝑣𝑣
=
=
4. (a)
=
=
=
7×𝑠𝑠×𝑑𝑑×𝑑𝑑×𝑑𝑑
×
15×𝑒𝑒×𝑒𝑒×𝑒𝑒
𝒕𝒕
Ans
πŸπŸπŸπŸπŸπŸπ’”π’”πŸπŸ
14π‘₯π‘₯ 3
9𝑦𝑦 2
14π‘₯π‘₯ 3
9𝑦𝑦 2
÷
×
3
28×𝑠𝑠×𝑠𝑠×𝑠𝑠×𝑑𝑑×𝑑𝑑
2π‘₯π‘₯−5
7π‘₯π‘₯ 4
×
=
7×π‘₯π‘₯×π‘₯π‘₯×π‘₯π‘₯×π‘₯π‘₯
π‘šπ‘š 2 −1
π‘šπ‘š 2 −12
π‘šπ‘š (π‘šπ‘š −1)
(π‘šπ‘š +1)(π‘šπ‘š −1)
π‘šπ‘š (π‘šπ‘š −1)
Ans
𝑝𝑝 2 π‘žπ‘ž 3
=
=
=
4
𝑝𝑝 2 π‘žπ‘ž 3
4
3π‘₯π‘₯−9−8π‘₯π‘₯+20
(2π‘₯π‘₯−5)(π‘₯π‘₯−3)
3π‘₯π‘₯−8π‘₯π‘₯−9+20
(2π‘₯π‘₯−5)(π‘₯π‘₯−3)
𝒑𝒑
−πŸ“πŸ“πŸ“πŸ“+𝟏𝟏𝟏𝟏
1
(c)
π‘₯π‘₯−4
=
2(π‘₯π‘₯ 2 −22 )
8
×
8
÷ 2𝑝𝑝2 π‘žπ‘ž
4
Ans
×
8
𝑝𝑝×π‘žπ‘ž
5π‘₯π‘₯−2π‘₯π‘₯−1+8
πŸ‘πŸ‘πŸ‘πŸ‘+πŸ•πŸ•
Compiled and Solved by Kachama Dickson C & Chansa John
= (𝒙𝒙−πŸ’πŸ’)(πŸ“πŸ“πŸ“πŸ“−𝟏𝟏) Ans
3
=
×
5π‘₯π‘₯−1
1(5π‘₯π‘₯−1)−2(π‘₯π‘₯−4)
(π‘₯π‘₯−4)(5π‘₯π‘₯−1)
= (π‘₯π‘₯−4)(5π‘₯π‘₯−1)
(c)
1
2𝑝𝑝 2 π‘žπ‘ž
2
5π‘₯π‘₯−1−2π‘₯π‘₯+8
π‘₯π‘₯+2
×
−
= (π‘₯π‘₯−4)(5π‘₯π‘₯−1)
π‘₯π‘₯+2
2(π‘₯π‘₯+2)(π‘₯π‘₯−2)
𝑝𝑝𝑝𝑝
Ans
= (𝟐𝟐𝟐𝟐−πŸ“πŸ“)(𝒙𝒙−πŸ‘πŸ‘) Ans
π‘₯π‘₯+2
𝑝𝑝×𝑝𝑝×π‘žπ‘ž×π‘žπ‘ž×π‘žπ‘ž
𝒒𝒒
4
π‘₯π‘₯+2
𝑝𝑝𝑝𝑝
−𝒙𝒙−πŸ•πŸ•
(𝒙𝒙+𝟏𝟏)(𝒙𝒙−𝟏𝟏)
π‘₯π‘₯−3
= 𝟐𝟐(𝒙𝒙 − 𝟐𝟐) Ans
×
3π‘₯π‘₯−4π‘₯π‘₯−3−4
(π‘₯π‘₯+1)(π‘₯π‘₯−1)
=
2(π‘₯π‘₯ 2 −4)
=
(b)
π‘šπ‘š 2 −π‘šπ‘š
−
2π‘₯π‘₯ 2 −8
=
18×𝑦𝑦×𝑦𝑦×𝑦𝑦
3π‘₯π‘₯−3−4π‘₯π‘₯−4
(π‘₯π‘₯+1)(π‘₯π‘₯−1)
=
9×𝑐𝑐×𝑐𝑐×𝑐𝑐×𝑛𝑛
4
π‘₯π‘₯−1
3(π‘₯π‘₯−1)−4(π‘₯π‘₯+1)
(π‘₯π‘₯+1)(π‘₯π‘₯−1)
=
10×𝑐𝑐×𝑐𝑐×𝑑𝑑×𝑑𝑑
−
3(π‘₯π‘₯−3)−4(2π‘₯π‘₯−5)
(2π‘₯π‘₯−5)(π‘₯π‘₯−3)
=
(b)
18𝑦𝑦 3
×
π‘₯π‘₯+1
=
=
7π‘₯π‘₯ 4
Ans
π’Žπ’Ž
Ans
πŸ—πŸ—π’„π’„πŸπŸ
5×𝑒𝑒×𝑒𝑒×𝑒𝑒×𝑒𝑒×𝑣𝑣
18𝑦𝑦 3
9×𝑦𝑦×𝑦𝑦
πŸ’πŸ’πŸ’πŸ’
π’Žπ’Ž+𝟏𝟏
πŸ–πŸ–π’π’πŸπŸ
=
14×π‘₯π‘₯×π‘₯π‘₯×π‘₯π‘₯
𝒙𝒙
15×𝑐𝑐×𝑑𝑑×𝑑𝑑×𝑑𝑑
(b)
28𝑠𝑠 3 𝑑𝑑 2
10𝑐𝑐 2 𝑑𝑑 2
9𝑐𝑐 3 𝑛𝑛
3
(c)
10𝑐𝑐 2 𝑑𝑑 2
12 ×𝑑𝑑×𝑛𝑛×𝑛𝑛×𝑛𝑛
=
5𝑒𝑒 3 𝑣𝑣
9𝑐𝑐 3 𝑛𝑛
×
15𝑐𝑐𝑐𝑐 3
=
2 ×
÷
12𝑑𝑑𝑑𝑑 3
=
Ans
𝒂𝒂+𝒃𝒃
=
=
15𝑐𝑐𝑐𝑐 3
−1(π‘Žπ‘Ž−𝑏𝑏)
(π‘Žπ‘Ž+𝑏𝑏)(π‘Žπ‘Ž−𝑏𝑏)
=
3. (a)
12𝑑𝑑𝑑𝑑 3
(b)
1
2×𝑝𝑝×𝑝𝑝×π‘žπ‘ž
−
2
π‘₯π‘₯+3
3(π‘₯π‘₯+3)−2(5π‘₯π‘₯−2)
=
=
=
5π‘₯π‘₯−2
(5π‘₯π‘₯−2)(π‘₯π‘₯+3)
3π‘₯π‘₯+9−10π‘₯π‘₯+4
(5π‘₯π‘₯−2)(π‘₯π‘₯+3)
3π‘₯π‘₯−10π‘₯π‘₯+9+4
(5π‘₯π‘₯−2)(π‘₯π‘₯+3)
−πŸ•πŸ•πŸ•πŸ•+𝟏𝟏𝟏𝟏
(πŸ“πŸ“πŸ“πŸ“−𝟐𝟐)(𝒙𝒙+πŸ‘πŸ‘)
Ans
/ Together we can do Mathematics /0966-295655
Page 39 of 84
5. (a)
=
π‘₯π‘₯−1
(b)
π‘₯π‘₯ 2 −1
π‘₯π‘₯−1
π‘₯π‘₯ 2 −12
π‘₯π‘₯−1
= (π‘₯π‘₯+1)(π‘₯π‘₯−1)
=
𝟏𝟏
𝒙𝒙+𝟏𝟏
Ans
17π‘˜π‘˜ 2
20π‘Žπ‘Ž 2
=
=
÷
17π‘˜π‘˜ 2
51π‘˜π‘˜ 2
5π‘Žπ‘Ž
5π‘Žπ‘Ž
= 20π‘Žπ‘Ž 2 × 51π‘˜π‘˜ 2
17×π‘˜π‘˜×π‘˜π‘˜
20×π‘Žπ‘Ž×π‘Žπ‘Ž
𝟏𝟏
𝟏𝟏𝟏𝟏𝟏𝟏
×
Ans
2
(c)
=
5×π‘Žπ‘Ž
=
51×π‘˜π‘˜×π‘˜π‘˜
−
1
2π‘₯π‘₯−1
3π‘₯π‘₯+1
2(3π‘₯π‘₯+1)−1(2π‘₯π‘₯−1)
(2π‘₯π‘₯−1)(3π‘₯π‘₯+1)
=
=
6π‘₯π‘₯+2−2π‘₯π‘₯+1
(2π‘₯π‘₯−1)(3π‘₯π‘₯+1)
6π‘₯π‘₯−2π‘₯π‘₯+2+1
(2π‘₯π‘₯−1)(3π‘₯π‘₯+1)
πŸ’πŸ’πŸ’πŸ’+πŸ‘πŸ‘
(𝟐𝟐𝟐𝟐−𝟏𝟏)(πŸ‘πŸ‘πŸ‘πŸ‘+𝟏𝟏)
Ans
TOPIC 2: MATRICES
1. (a) deter A = (4 × 2) − (1 × −5)
(b)
= 8 − (−5)
=8+5
∴ 𝑫𝑫𝑫𝑫𝑫𝑫 𝑨𝑨 = 13 Ans
deter 𝐡𝐡 = (8 × 5) − (3 × π‘¦π‘¦)
13 = 40 − 3𝑦𝑦
13 − 40 = −3𝑦𝑦
−27 = −3𝑦𝑦 dividing both sides by 3 we have,
π’šπ’š = πŸ—πŸ— Ans
2. (a) Deter A = (2π‘₯π‘₯ × π‘₯π‘₯) − (2 × 3)
2π‘₯π‘₯ 2 − 6 = 12
2π‘₯π‘₯ 2 = 18
π‘₯π‘₯ 2 = 9
π‘₯π‘₯ = √9
π‘₯π‘₯ = ±3
∴ 𝒙𝒙 = πŸ‘πŸ‘ Ans
πŸ‘πŸ‘. (a) Deter M= (3× π‘₯π‘₯) − (5 × −2)
22 = 3π‘₯π‘₯ − (−10)
22 = 3π‘₯π‘₯ + 10
22 − 10 = 3π‘₯π‘₯
12 = 3π‘₯π‘₯
𝒙𝒙 = πŸ’πŸ’ Ans
8 𝑦𝑦
οΏ½,
3 5
8 9
οΏ½
B=οΏ½
3 5
𝟏𝟏
πŸ“πŸ“ −πŸ—πŸ—
οΏ½ Ans
𝐁𝐁 −𝟏𝟏 = οΏ½
𝟏𝟏𝟏𝟏 −πŸ‘πŸ‘
πŸ–πŸ–
𝐡𝐡 = �
(b) A = οΏ½
2×3
3
𝑨𝑨−𝟏𝟏
2
6 2
οΏ½=οΏ½
οΏ½
3
3 3
𝟏𝟏
πŸ‘πŸ‘ −𝟐𝟐
οΏ½ Ans
= οΏ½
𝟏𝟏𝟏𝟏 −πŸ‘πŸ‘
πŸ”πŸ”
−2
οΏ½
4
𝟏𝟏
πŸ’πŸ’ 𝟐𝟐
οΏ½ Ans
= οΏ½
𝟐𝟐𝟐𝟐 −πŸ“πŸ“ πŸ‘πŸ‘
(b) 𝑀𝑀 = οΏ½
𝑴𝑴−𝟏𝟏
3
5
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 40 of 84
𝟏𝟏
4. (a) |K|= (10 × −2) − (11 × −2)
= −20 − (−22)
= −20 + 22
∴ 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 𝐾𝐾 = 𝟐𝟐 Ans
(b) 𝐊𝐊 −𝟏𝟏 = οΏ½
𝟐𝟐
5. (a) deter Q = (3 × 4) − (π‘₯π‘₯ × −2)
−𝟐𝟐
−𝟏𝟏𝟏𝟏
𝟐𝟐
οΏ½ Ans
𝟏𝟏𝟏𝟏
3 −2
οΏ½
−5 4
𝟏𝟏 πŸ’πŸ’ −𝟐𝟐
οΏ½ Ans
= οΏ½
𝟐𝟐 πŸ“πŸ“
πŸ‘πŸ‘
(b) Q = οΏ½
𝑸𝑸−𝟏𝟏
2 = 12 − (−2π‘₯π‘₯)
2 = 12 + 2π‘₯π‘₯
2 − 12 = 2π‘₯π‘₯
−10 = 2π‘₯π‘₯
𝒙𝒙 = −πŸ“πŸ“ Ans
TOPIC 3: SETS
1. (i)
(ii) (a) Physics only = 6 students Ans
E Maths
(b) two subject only = 2 + 5
= 7 students Ans
(c) Maths and Physics not chem = 2 Ans
Chemistry
5
4
2
0
3
0
6
Physics
2. (i) 4 + π‘₯π‘₯ + 3 + 7 = 22
π‘₯π‘₯ + 14 = 22
π‘₯π‘₯ = 22 − 14
𝒙𝒙 = πŸ–πŸ– Ans
3. (i)
E
Ans
(ii) (a) only 1 mode of transport = 7 + 14 + 7 = 𝟐𝟐𝟐𝟐
(b) 2 different modes of transport
=4+2+3+8
= 17 Ans
Maize
(ii) (a) total = 6 +19 + 5+ 9+ 3+ 15+ 2+ 11
11
19
2
Cassava
(b) maize only = 19 farmers
9
5
6
15
3
4. (i) 2𝑦𝑦 + 1 = 7
2𝑦𝑦 = 7 − 1
= 70 farmers
2𝑦𝑦 = 6 → π’šπ’š = 3 Ans
(c) two different crops = 11+5+15+9
Sweet potatoes
= 40 farmers
(ii) (a) Victoria falls but not Gonya = 6+2 = 8 students
(b) two tourist attraction only = 4 +1 + 2 = 7 students
(c) one tourists attraction only = 6 + 8 + 7 = 21 students
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 41 of 84
5. (i) E
(ii) (a) Music only = 5 villagers
News
Sports
7
(b) one type only = 10 + 9 + 5
= 24 villagers
(c) two types of programs only = 8 + 7 + 5
= 20 Villagers
9
10
4
8
5
Music
5
TOPIC 4: PROBABILITY
1. Total 6 + 9 = 15 (hint: use the tree diagram for easy calculations of probabilities)
B
BB
R
BR
B
RB
5/14
B
6οΏ½
15
9/14
6/14
9/15
R
8/14
R
(a) P( one is black) = P(BB) + P(BR) + P(RB)
=οΏ½
=
=
=
6
15
30
210
138
210
𝟐𝟐𝟐𝟐
πŸ‘πŸ‘πŸ‘πŸ‘
×
+
5
14
54
οΏ½+οΏ½
210
Ans
+
6
15
54
210
×
9
14
RR
(b) P(different colour) = P(BR)+P(RB)
οΏ½+οΏ½
9
15
×
6
14
οΏ½
= οΏ½
=
=
=
6
15
54
210
108
210
𝟏𝟏𝟏𝟏
πŸ‘πŸ‘πŸ‘πŸ‘
×
+
9
οΏ½+οΏ½
14
54
210
9
15
×
6
14
Ans
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
οΏ½
Page 42 of 84
2. (a) Total 𝟐𝟐𝟐𝟐 + 𝟏𝟏𝟏𝟏 + πŸ’πŸ’ = πŸ‘πŸ‘πŸ‘πŸ‘
B
BB
R
BR
W
BW
RB
19/35
12/35
B
20/36
4/35
20/35 B
12/36
11/35
R
R
W
B
4/35
4/36
RR
RW
WB
W 20/35
12/35
R
WB
W
WW
3/35
(b) P( both white) = P(WW)
=
=
=
4
36
12
×
1260
𝟏𝟏
𝟏𝟏𝟏𝟏𝟏𝟏
3
35
Ans
3. (a) Total πŸ“πŸ“ + πŸ’πŸ’ + πŸ‘πŸ‘ = 𝟏𝟏𝟏𝟏
(b) P(Same colour) = P(WW) + P( BB) + (YY)
= οΏ½
=
5
12
20
132
×
+
4
11
12
οΏ½+οΏ½
132
+
4
12
6
132
×
=
3
11
38
οΏ½+οΏ½
132
=
3
12
𝟏𝟏𝟏𝟏
πŸ”πŸ”πŸ”πŸ”
×
Ans
Compiled and Solved by Kachama Dickson C & Chansa John
2
11
οΏ½
/ Together we can do Mathematics /0966-295655
Page 43 of 84
4. Faulty = 3 and good = 10 – 3 = 7
Use a tree diagram below for easy calculations
(a) P( both good) = P(G, G)
=οΏ½
=
=
7
10
56
90
πŸ•πŸ•
𝟏𝟏𝟏𝟏
6
× οΏ½
9
Ans
(b) P (one is faulty and the one is good) = 𝑃𝑃(𝐺𝐺, 𝐹𝐹) + 𝑃𝑃(𝐹𝐹, 𝐺𝐺)
=
=οΏ½
7
3
× οΏ½+οΏ½
10
21 21
+
90 90
=
=
9
3
10
7
× οΏ½
9
42
90
πŸ•πŸ•
𝟏𝟏𝟏𝟏
Ans
5. P( negative) = 1- P(positive)
= 1-0.6
= 0.4
(a) P (1 negative & other positive) = (0.6× 0.4) + (0.4 × 0.6)
(b) P(both positive) = (0.4× 0.4)
= 𝟎𝟎. 𝟏𝟏𝟏𝟏 Ans
= 0.24 + 0.24
= 0.48
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 44 of 84
TOPIC 5: SEQUENCES AND SERIES
1. (a) π‘˜π‘˜ + 4, π‘˜π‘˜, 2π‘˜π‘˜ − 15
π‘˜π‘˜
π‘˜π‘˜+4
(b) π‘˜π‘˜ + 4, π‘˜π‘˜, 2π‘˜π‘˜ − 15
2π‘˜π‘˜−15
=
π‘˜π‘˜
π‘˜π‘˜ 2 = (π‘˜π‘˜ + 4)(2π‘˜π‘˜ − 15)
(c) 𝑆𝑆∞ =
12 + 4, 12, 2(12) − 15
𝑆𝑆∞ =
16, 12, 9,… Ans
𝑆𝑆∞ =
π‘˜π‘˜ 2 = 2π‘˜π‘˜ 2 − 15π‘˜π‘˜ + 8π‘˜π‘˜ − 60
𝑆𝑆∞ =
2π‘˜π‘˜ 2 − π‘˜π‘˜ 2 − 7π‘˜π‘˜ − 60 = 0
π‘˜π‘˜ 2 − 7π‘˜π‘˜ − 60 = 0
π‘˜π‘˜ 2 + 5π‘˜π‘˜ − 12π‘˜π‘˜ − 60 = 0
π‘˜π‘˜(π‘˜π‘˜ + 5) − 12(π‘˜π‘˜ + 5) = 0
(π‘˜π‘˜ + 5)(π‘˜π‘˜ − 12) = 0
π‘˜π‘˜ = −5 π‘œπ‘œπ‘œπ‘œ π‘˜π‘˜ = 12
∴ π’Œπ’Œ = 𝟏𝟏𝟏𝟏 Ans
2
π‘Žπ‘Ž =
2
3−1
𝑆𝑆5 =
27
3
2
27
2
27
=
=
2
9π‘Ÿπ‘Ÿ 2
2π‘Ÿπ‘Ÿ
9
× π‘Ÿπ‘Ÿ 3
2
9π‘Ÿπ‘Ÿ 2
𝑆𝑆5 = 3(
in (ii) we have
𝑆𝑆5 =
π‘Ÿπ‘Ÿ =
π‘Žπ‘Ž =
3
2
1 2
9×οΏ½ οΏ½
3
π‘Žπ‘Ž = 2
243
242
81
)
1
4
4−3
4
16
1
4
)÷
)×
=2
π‘Žπ‘Ž
1−π‘Ÿπ‘Ÿ
2
𝑆𝑆∞ =
2
80
81
2
= 𝟐𝟐. πŸ—πŸ—πŸ—πŸ— Ans
1
3
1−
𝑆𝑆∞ =
18
54
1
3
243
3
243−1
3
243
242
(c) 𝑆𝑆∞ =
54π‘Ÿπ‘Ÿ = 18
π‘Ÿπ‘Ÿ =
1 5
3
1
1−
3
1
2(1− 5 )
3
2
3
𝑆𝑆5 = 2(
= π‘Žπ‘Žπ‘Ÿπ‘Ÿ …………………. Equation (ii)
Replacing π‘Žπ‘Ž by
=
1−π‘Ÿπ‘Ÿ
𝑆𝑆5 = 2(1 −
𝑇𝑇4 = π‘Žπ‘Žπ‘Ÿπ‘Ÿ 4−1
2
16
16
2(1−οΏ½ οΏ½ )
𝑆𝑆5 =
…………….. equation (i)
9π‘Ÿπ‘Ÿ 2
3
4
1−
12
π‘Žπ‘Ž(1−π‘Ÿπ‘Ÿ 𝑛𝑛 )
(b) 𝑆𝑆𝑛𝑛 =
= π‘Žπ‘Žπ‘Ÿπ‘Ÿ 2
9
,r=
𝑺𝑺∞ = πŸ”πŸ”πŸ”πŸ” Ans
2. (a) 𝑇𝑇𝑛𝑛 = π‘Žπ‘Žπ‘Ÿπ‘Ÿ 𝑛𝑛−1
𝑇𝑇3 = π‘Žπ‘Žπ‘Ÿπ‘Ÿ
π‘Žπ‘Ž
1−π‘Ÿπ‘Ÿ
16
2
2
3
𝑺𝑺∞ = πŸ‘πŸ‘ Ans
=
2
9×
1
9
𝟏𝟏
∴ the first term is 2 and common ratio is Ans
πŸ‘πŸ‘
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 45 of 84
3. (a) π‘Ÿπ‘Ÿ =
5
1
(c) 𝑆𝑆𝑛𝑛 =
= = 0.25
20
4
(b) 𝑇𝑇𝑛𝑛 = π‘Žπ‘Žπ‘Ÿπ‘Ÿ 𝑛𝑛−1
𝑆𝑆8 =
1 𝑛𝑛−1
𝑇𝑇𝑛𝑛 = 20 οΏ½ οΏ½
𝑇𝑇𝑛𝑛 = 20
∴ 𝑻𝑻𝒏𝒏
=
𝟐𝟐𝟐𝟐
πŸ’πŸ’π’π’−𝟏𝟏
𝑆𝑆8 =
Ans
10+𝑛𝑛
6+𝑛𝑛
=
𝑇𝑇2
=
𝑇𝑇1
15+𝑛𝑛
10+𝑛𝑛
𝑇𝑇3
𝑇𝑇2
=β‹―
(c)
𝑇𝑇𝑛𝑛
100 + 20𝑛𝑛 + 𝑛𝑛 = 90 + 21n + 𝑛𝑛
100 − 90 = 21𝑛𝑛 – 20𝑛𝑛
10 = 𝑛𝑛
∴ 𝒏𝒏 =10
The GP is: 16, 20, 25 . . .
16
=
5
4
π‘œπ‘œπ‘œπ‘œ 𝟏𝟏. 𝟐𝟐𝟐𝟐
𝑇𝑇
π‘₯π‘₯−3
=
1
π‘₯π‘₯−1
π‘₯π‘₯−3
S6
𝑇𝑇
𝑇𝑇
2
𝑛𝑛 −1
π‘₯π‘₯ 2 − 6π‘₯π‘₯ + 9 = π‘₯π‘₯ 2 − 1
−6π‘₯π‘₯ = −1 − 9
π‘₯π‘₯ =
3
𝟐𝟐
πŸ‘πŸ‘
Hence the GP is;
8 −4 2
3
,
3
, ,…
3
1.25−1
16(3.814697266 −1)
=
(C)
𝑆𝑆∞ =
𝑆𝑆∞ =
𝑆𝑆∞ =
0.25
16(2.814697266 )
0.25
45.03515625
0.25
π‘Žπ‘Ž
1−π‘Ÿπ‘Ÿ
8/3
8/3
16
9
3
2
8
3
8
3
∴ 𝑺𝑺∞ = 𝟏𝟏
5
3
5
1
2
1−(− )
𝑆𝑆∞ =
𝑆𝑆∞ =
10
𝒙𝒙 = 𝟏𝟏 Ans
for r > 1
π‘Ÿπ‘Ÿ−1
16((1.25)6 −1)
÷
𝑆𝑆∞ = ×
−6π‘₯π‘₯ = −10
6
5
S6
=
π‘Žπ‘Ž(π‘Ÿπ‘Ÿ 𝑛𝑛 −1)
S 6 = 180.140625
∴ S6 = 𝟏𝟏𝟏𝟏𝟏𝟏Ans
(π‘₯π‘₯ − 3) (π‘₯π‘₯ − 3) = ( π‘₯π‘₯ − 1) ( π‘₯π‘₯ + 1)
π‘₯π‘₯ =
𝑆𝑆𝑛𝑛 =
S6 =
2
5. (a) We know that r = 𝑇𝑇2 = 𝑇𝑇3 = β‹― 𝑇𝑇 𝑛𝑛
π‘₯π‘₯+1
0.75
𝑆𝑆6 =
𝑇𝑇𝑛𝑛 −1
2
20
0.75
20(0.9999847412 )
π‘Ίπ‘ΊπŸ–πŸ– = 𝟐𝟐𝟐𝟐. πŸ•πŸ• Ans
(10 + 𝑛𝑛) (10 + 𝑛𝑛) = (6 + 𝑛𝑛) (15 + 𝑛𝑛)
(b) 𝒓𝒓 =
1−0.25
20 (1−0.00001558906 )
𝑆𝑆8 = 26.66625977
4. (a) to find n, we use the common ratio formula
That is r=
for r < 1
1−π‘Ÿπ‘Ÿ
20(1−(0.25)8 )
𝑆𝑆8 =
4
1𝑛𝑛 −1
4 𝑛𝑛 −1
π‘Žπ‘Ž(1−π‘Ÿπ‘Ÿ 𝑛𝑛 )
πŸ•πŸ•
πŸ—πŸ—
3
2
2
3
Ans
5
+ 1. − 3, − 1 … … ..
3
3
πŸ–πŸ–
(b) the first term “π‘Žπ‘Ž” = Ans
πŸ‘πŸ‘
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 46 of 84
TOPIC 6: PSEUDO CODE AND FLOWCHART
1.
Start
Enter 𝒙𝒙, π’šπ’š
M = (𝒙𝒙^2+π’šπ’š^2)
Is
M< 0
yes
Error ‘M’ must be
positive
No
Display
M
Stop
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 47 of 84
2.
Start
Enter 𝒂𝒂, 𝒓𝒓, 𝒏𝒏
𝑹𝑹 = 𝟏𝟏 − 𝒓𝒓
Is
𝑹𝑹 = 𝟎𝟎?
𝐍𝐍𝐍𝐍
𝑺𝑺𝒏𝒏 =
yes
value of r
is not valid
𝒂𝒂(𝟏𝟏−𝒓𝒓𝒏𝒏 )
𝟏𝟏−𝒓𝒓
Display 𝑺𝑺𝒏𝒏
Stop
3. Start
Enter radius
If radius < 0
Then display “error message “
1
Else Area = ∗ π‘Ÿπ‘Ÿ ∗ π‘Ÿπ‘Ÿ ∗ 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
2
End if
Display Area
Stop
4. Start
Enter a and r
If |π‘Ÿπ‘Ÿ| < 1
Then sum to infinity =
Else
End if
Display sum to infinity
Stop
π‘Žπ‘Ž
1−π‘Ÿπ‘Ÿ
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 48 of 84
5.
Start
Enter, r
Is
yes
𝒓𝒓 < 0?
Error
“r must be positive”
No
Enter h
Is h < 0?
Yes
Error
“h must be Positive”
No
𝟏𝟏
𝒗𝒗 = 𝝅𝝅 ∗ 𝒓𝒓 ∗ 𝒓𝒓 ∗ 𝒉𝒉
πŸ‘πŸ‘
Display Volume
Stop
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 49 of 84
TOPIC 7: LOCI AND CONSTRUCTION
1.
b (i)
Z
b (ii)
5.5 cm
T
7 cm
P (c)
38 °
9 cm
X
Y
R
2.
b(ii
(i)
7.8 cm
8 cm
b(iii
X
T
P
πŸ“πŸ“πŸ“πŸ“°
10 cm
b(i)
Q
D
3.
8.9cm
C
11cm
P
QP
PPPPP
7 cm
AA
60°
10cm
𝟏𝟏𝟏𝟏𝟏𝟏°
B
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 50 of 84
R
4.
b(iii)
b(ii)
10 cm
9.5cm
b(i)
P
60°
9 cm
Q
5.
C
b (i)
b (ii)
7 cm
b (iii)
7 cm
R
A
7 cm
Compiled and Solved by Kachama Dickson C & Chansa John
B
/ Together we can do Mathematics /0966-295655
Page 51 of 84
TOPIC 8: CALCULUS
2
1. (a) ∫−1(2 + π‘₯π‘₯ − π‘₯π‘₯ 2 )𝑑𝑑𝑑𝑑
= οΏ½2π‘₯π‘₯ +
=οΏ½
2(2)
+
1
π‘₯π‘₯ 2
2
22
2
−
−
8
π‘₯π‘₯ 3
3
23
3
2
οΏ½ −1
m1 =
οΏ½ − οΏ½2(−1) −
1
1
= οΏ½4 + 2 − οΏ½ — οΏ½2 − + οΏ½
10
3
−7
2
=οΏ½ οΏ½−οΏ½ οΏ½
=
=
10
3
+
3
27
6
6
7
6
4
(b) 𝑦𝑦 = π‘₯π‘₯ + →
(−1)2
3
2
−
(−1)3
3
π‘₯π‘₯
𝑑𝑑𝑑𝑑
=1−
𝑑𝑑𝑑𝑑
R
3
=οΏ½ −
3
1
2(1)2
2
3
0
3
0
2
1
= −4−0
=
16
3
1−12
=
3
4
4
3
πŸ‘πŸ‘
𝑑𝑑𝑑𝑑
𝑑𝑑𝑑𝑑
P
Multiplying through by
πŸ‘πŸ‘πŸ‘πŸ‘ = −πŸ’πŸ’πŸ’πŸ’ + πŸ‘πŸ‘πŸ‘πŸ‘ Ans
= 4π‘₯π‘₯ − 3 π‘Žπ‘Žπ‘Žπ‘Ž (3,7) →
1
π‘šπ‘š2 = −1 × = −
9
1
9
𝑑𝑑𝑑𝑑
𝑑𝑑𝑑𝑑
= π‘šπ‘š1 = 4(3) − 3 = 9
∴ equation of the normal to the curve is given by
π’šπ’š − π’šπ’šπŸπŸ = π‘šπ‘š2 (π‘₯π‘₯ − π‘₯π‘₯1 )
1
𝑦𝑦 − 7 = − (π‘₯π‘₯ − 3)
3
11
=−
16
+5
3
πŸ‘πŸ‘πŸ‘πŸ‘
(b) 𝑦𝑦 = 2π‘₯π‘₯ 2 − 3π‘₯π‘₯ − 2
− (3)οΏ½ − οΏ½ − + 3(0)οΏ½
= οΏ½ − 1 − 3οΏ½ − 0
12
π’šπ’š − π’šπ’šπŸπŸ = π‘šπ‘š2 (π‘₯π‘₯ − π‘₯π‘₯1 )
4
𝑦𝑦 − 5 = − (π‘₯π‘₯ − 4)
3
2. (a) ∫0 (π‘₯π‘₯ 2 − 2π‘₯π‘₯ − 3)𝑑𝑑𝑑𝑑
13
=
4
P
− 3π‘₯π‘₯οΏ½ 10
16
∴ Equation of the normal is given by
3
2
16−4
4
πŸ‘πŸ‘
2π‘₯π‘₯ 2
=
at π‘₯π‘₯ = 4
𝑦𝑦 = 4 + = 4 + 1 = 5
π’šπ’š = − 𝒙𝒙 +
−
4
16
4
π‘₯π‘₯ 2
To find y replace π‘₯π‘₯ = 4 in the original equat
3
πŸ’πŸ’
3
=1−
4
4
π‘₯π‘₯ 3
4
42
=1−
m 2 = −1 × = −
𝑦𝑦 = − π‘₯π‘₯ +
=οΏ½
𝑑𝑑𝑑𝑑
m 1 × m 2 = −1 (tangent ⊥ to normal)
οΏ½
= 4. πŸ“πŸ“ Ans
1
𝑑𝑑𝑑𝑑
9
1
𝑦𝑦 − 7 = − π‘₯π‘₯ +
3
𝟐𝟐
= −πŸ‘πŸ‘ Ans
1
9
3
9
1
9
66
𝑦𝑦 = − π‘₯π‘₯ + +
πŸ‘πŸ‘
9
1
𝑦𝑦 = − π‘₯π‘₯ +
𝑦𝑦 = − π‘₯π‘₯ +
9
7
9
1
3+63
3
9
9
πŸ—πŸ—πŸ—πŸ— = −𝒙𝒙 + πŸ”πŸ”πŸ”πŸ” Ans
A journey of thousand miles
starts with one step
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 52 of 84
3. (a) 𝑦𝑦 = 2π‘₯π‘₯ 3 − 3π‘₯π‘₯ 2 − 36π‘₯π‘₯ − 3
𝑑𝑑𝑑𝑑
= 6π‘₯π‘₯ 2 − 6π‘₯π‘₯ − 36
𝑑𝑑𝑑𝑑
3
(b) ∫−1(3π‘₯π‘₯ 2 − 2π‘₯π‘₯)𝑑𝑑𝑑𝑑
=οΏ½
0 = 6π‘₯π‘₯ 2 − 6π‘₯π‘₯ − 36 dividing through by 6
3π‘₯π‘₯ 3
3
3
2π‘₯π‘₯ 2
οΏ½ 3
2 −1
3
− π‘₯π‘₯ 2 ] −1
3
2]
−
= [π‘₯π‘₯
= [(3) − (3)
π‘₯π‘₯ 2 − π‘₯π‘₯ − 6 = 0
− [(−1)3 − (−1)2 ]
= (27 − 9) – (−1 − 1)
=18 – (−2)
= 18+2 = 20
(π‘₯π‘₯ + 2) (π‘₯π‘₯ − 3) = 0
π‘₯π‘₯ = −2 π‘œπ‘œπ‘œπ‘œ π‘₯π‘₯ = 3
When π‘₯π‘₯ = −2
3
∴ ∫−1(3π‘₯π‘₯ 2 − 2π‘₯π‘₯)𝑑𝑑𝑑𝑑 = 20 Ans
𝑦𝑦 = −16 − 12 + 72 − 3
𝑦𝑦 = 41
When π‘₯π‘₯ = 3
𝑦𝑦 = 2(−2)3 − 3(−2)2 − 36(−2) − 3
𝑦𝑦 = 2(3)3 – 3(3)2 − 36 (3) − 3
𝑦𝑦 = −84
∴ the coordinates on curve are (− 𝟐𝟐, πŸ’πŸ’πŸ’πŸ’) and (πŸ‘πŸ‘, −πŸ–πŸ–πŸ–πŸ–) Ans
5
4. (a) ∫2 (3π‘₯π‘₯ 2 + 2)𝑑𝑑𝑑𝑑
3π‘₯π‘₯ 2+1
=οΏ½
2+1
3π‘₯π‘₯ 3
+
𝑦𝑦 = π‘₯π‘₯2 − 3π‘₯π‘₯ − 4
(b)
2π‘₯π‘₯ 0+1 5
οΏ½
0+1 2
2π‘₯π‘₯
= οΏ½ + οΏ½ 52
3
1
= [π‘₯π‘₯ 3 + 2π‘₯π‘₯] 52
3
π‘šπ‘š =
𝑦𝑦 − 𝑦𝑦1 = π‘šπ‘š(π‘₯π‘₯ − π‘₯π‘₯1 )
𝑦𝑦 − (−6) = 1(π‘₯π‘₯ − 2)
= (135) – (12)
= 𝟏𝟏𝟏𝟏𝟏𝟏Ans
𝑑𝑑𝑑𝑑
𝑑𝑑𝑑𝑑
𝑦𝑦 + 6 = π‘₯π‘₯ − 2
π’šπ’š = 𝒙𝒙 + πŸ–πŸ– Ans
(b) At the stationary points,
2
2
= 3π‘₯π‘₯ 2 − 3π‘₯π‘₯ = 3(2) – 3(2)= 6
1
6
Which is the gradient of the normal?
𝑦𝑦 − 𝑦𝑦1 = π‘šπ‘š2 (π‘₯π‘₯ − π‘₯π‘₯1 ) (2,2)
1
1
6
1
6
𝑦𝑦 = − π‘₯π‘₯ +
6
1
𝑦𝑦 = − π‘₯π‘₯ +
6
2+12
6
14
6
Compiled and Solved by Kachama Dickson C & Chansa John
2
For π‘₯π‘₯ = 1
2
=0
1
2
∴ the stationary points are;
→ Multiplying throughout by 6, we get
πŸ”πŸ”πŸ”πŸ” = −𝒙𝒙 + 𝟏𝟏𝟏𝟏 Ans
𝑑𝑑𝑑𝑑
3
𝑦𝑦 = (0) 3 - (0)2 = 0
3
𝑦𝑦 =− π‘₯π‘₯ + + 2
𝑑𝑑𝑑𝑑
3π‘₯π‘₯(π‘₯π‘₯ − 1) = 0
π‘₯π‘₯ = 0 π‘œπ‘œπ‘œπ‘œ π‘₯π‘₯ = 1
For π‘₯π‘₯ = 0.
𝑦𝑦 = (1)3 − (1)2 = −
𝑦𝑦 − 2 = − (π‘₯π‘₯ − 2)
6
2
3π‘₯π‘₯ −3π‘₯π‘₯ = 0
P
∴ π‘šπ‘š1 = 6 which is the gradient of tangent to the curve
𝑀𝑀𝑀𝑀 know that tangent is perpendicular to the normal,
π‘šπ‘š1 π‘šπ‘š2 = −1, at π‘₯π‘₯ = 2, 𝑦𝑦 = 2
π‘šπ‘š2 = −
= 2π‘₯π‘₯ − 3 at π‘₯π‘₯ = 2, π‘šπ‘š = 2(2) − 3 = 1
∴ equation of the tangent is given by
3
= (125 + 10) – (8 + 4)
3
𝑑𝑑𝑑𝑑
𝑦𝑦 = (2)2 − 3(2) − 4 = −6
= ( (5) + 2(5) ) − (2 + 2(2))
5. (a) 𝑦𝑦 = π‘₯π‘₯ 3 − 2 π‘₯π‘₯ 2
𝑑𝑑𝑑𝑑
𝟏𝟏
(0, 0) and (1, − ) Ans
𝟐𝟐
/ Together we can do Mathematics /0966-295655
Page 53 of 84
TOPIC 9: VECTORS
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 1 𝐴𝐴𝐴𝐴
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
1. (i) (a) 𝐴𝐴𝐴𝐴
𝟐𝟐
(ii) Since οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = ( 𝒃𝒃 − 𝒂𝒂 )
3
πŸ‘πŸ‘
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 𝐴𝐴𝐴𝐴
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + 𝐡𝐡𝐡𝐡
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = π‘Žπ‘Ž + 2𝑏𝑏
𝐴𝐴𝐴𝐴
U
U
πŸ‘πŸ‘
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = ( 𝒂𝒂 + 2𝒃𝒃 ) Ans
∴ 𝑨𝑨𝑨𝑨
πŸ‘πŸ‘
U
U
𝐡𝐡𝐡𝐡 = οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 + οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴
(b) οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
1
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = -π‘Žπ‘Ž + ( π‘Žπ‘Ž + 2𝑏𝑏 )
𝐡𝐡𝐡𝐡
U
3
U
1
U
2
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = −π‘Žπ‘Ž + π‘Žπ‘Ž + 𝑏𝑏
𝐡𝐡𝐡𝐡
3
−3π‘Žπ‘Ž+π‘Žπ‘Ž
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— =
𝐡𝐡𝐡𝐡
3
2
U
and οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = 𝒃𝒃 − 𝒂𝒂
𝟐𝟐
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑩𝑩𝑩𝑩 = οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑩𝑩𝑩𝑩
U
𝟏𝟏
U
3
U
2
U
+ 𝑏𝑏
3
2
∴ the points 𝑩𝑩, 𝑬𝑬 and 𝑫𝑫 are collinear
(c)
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = −𝐴𝐴𝐴𝐴
𝐡𝐡𝐡𝐡
𝐴𝐴𝐴𝐴
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = − π‘Žπ‘Ž + 𝑏𝑏
U
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑩𝑩𝑩𝑩 = 𝒃𝒃 – 𝒂𝒂 Ans
U
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = − π‘Žπ‘Ž + 𝑏𝑏
2
3
2
3
∴ οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = b – π‘Žπ‘Ž
3
3
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 𝟐𝟐 ( 𝒃𝒃 − 𝒂𝒂 ) Ans
𝑩𝑩𝑩𝑩
πŸ‘πŸ‘
U
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = PO
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + OQ
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
2. (i) (a) PQ
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = − 2p + 4q
PQ
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 4q – 2p
PQ
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 2 (2q –p) Ans
∴ 𝐏𝐏𝐏𝐏
(b)
(c)
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½βƒ— = 1 PQ
PX
3
οΏ½οΏ½οΏ½οΏ½βƒ— = 𝟏𝟏 (4q –2p) Ans
PX
πŸ‘πŸ‘
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + οΏ½οΏ½οΏ½οΏ½βƒ—
OX = OP
PX
4
2
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OX = 2p + q − p
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OC = hOX
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = h (4p + 4q )
OC
∴
3
3
4h
4h
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OC = p + q
3
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = CO
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + OQ
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
CQ
4h
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = − ( P + 4h q) + 4q
CQ
3
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 4q − 4h q – 4h p
CQ
3
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = πŸ’πŸ’(1− 𝐑𝐑) q – πŸ’πŸ’πŸ’πŸ’ p hence shown
𝐂𝐂𝐂𝐂
πŸ‘πŸ‘
πŸ‘πŸ‘
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 2p − 2 p− 4 q
OX
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 6p−2p − 4q
OX
3
3
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = πŸ’πŸ’ p − πŸ’πŸ’ q
𝐎𝐎𝐎𝐎
πŸ‘πŸ‘
πŸ‘πŸ‘
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 54 of 84
Get your own copy direct from the Authors
3.
(a)
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 1 CA
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
(b) CD
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = OA
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + AB
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OB
2
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 1 (−2𝑏𝑏 +π‘Žπ‘Ž )
CD
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 𝒂𝒂 + 2𝒃𝒃
𝐎𝐎𝐎𝐎
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐢𝐢𝐢𝐢
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— and
(b) To find οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OE, first find CA
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = CO
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + OA
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
CA
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = −2b + a
𝐢𝐢𝐢𝐢
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴 = − 𝐢𝐢𝐢𝐢
4
2
U
U
1
= − 𝑏𝑏 + π‘Žπ‘Ž
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— =
π‘ͺπ‘ͺπ‘ͺπ‘ͺ
𝟏𝟏
𝟐𝟐
U
2
U
𝒂𝒂 – 𝒃𝒃 Ans
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = − 3 ( π‘Žπ‘Ž −2𝑏𝑏 )
𝐴𝐴𝐴𝐴
4
U
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + AE
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
∴ οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
OE = OA
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂 = π‘Žπ‘Ž − ( π‘Žπ‘Ž −2𝑏𝑏 )
4
U
U
3
U
6
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂 = π‘Žπ‘Ž − π‘Žπ‘Ž + 𝑏𝑏
4
4π‘Žπ‘Ž−3π‘Žπ‘Ž
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— =
𝑂𝑂𝑂𝑂
1
4
3
+ 𝑏𝑏
4
3
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂 = π‘Žπ‘Ž + 𝑏𝑏
4
𝟏𝟏
U
4
U
4
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑢𝑢𝑢𝑢 = (𝒂𝒂 + 3𝒃𝒃 ) Ans
πŸ’πŸ’
U
U
𝐴𝐴𝐴𝐴 = οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴 + οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂
4. (i) (a) οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴 = −3a + 6b
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴 = 6b −3a
𝑨𝑨𝑨𝑨 = 3 (2b −a) Ans
∴ οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
(b) 𝑂𝑂𝑂𝑂
𝑂𝑂𝑂𝑂 + οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐴𝐴𝐴𝐴
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— + 1 οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂 = 𝑂𝑂𝑂𝑂
𝐴𝐴𝐴𝐴
3
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂 = 3a + 2b – a
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 2a + 2b
𝑂𝑂𝑂𝑂
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑢𝑢𝑢𝑢 = 2(𝒂𝒂 + 𝒃𝒃 ) Ans
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = β„Žπ΅π΅π΅π΅
(ii) οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = β„Ž(6 a – 6b)
𝐡𝐡𝐡𝐡
3
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = 3a + 1 (6b −3a)
𝑂𝑂𝑂𝑂
U
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
(c) 𝐡𝐡𝐡𝐡
𝐡𝐡𝐡𝐡 + οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂
2
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡
−𝑂𝑂𝑂𝑂 + οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝑂𝑂𝑂𝑂
5
2
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = − 6b + (3a)
5
6π‘Žπ‘Ž
οΏ½οΏ½οΏ½οΏ½οΏ½βƒ—
𝐡𝐡𝐡𝐡 = − 6b +
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— =
𝑩𝑩𝑩𝑩
πŸ”πŸ”
πŸ“πŸ“
5
a − 6 b Ans
5
𝒉𝒉
οΏ½οΏ½οΏ½οΏ½οΏ½οΏ½βƒ— = πŸ”πŸ”( a – hb) Ans
𝑩𝑩𝑩𝑩
πŸ“πŸ“
Produced by Sir DK & Sir JC
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 55 of 84
TOPIC 10: TRIGONOMETRY
𝑛𝑛
1. (a)(i)
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
𝑛𝑛
𝑠𝑠𝑠𝑠𝑠𝑠 60
=
𝑛𝑛 =
=
π‘Ÿπ‘Ÿ
(ii) Area of βˆ†πΎπΎπΎπΎπΎπΎ
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
80
1
A = π‘˜π‘˜π‘˜π‘˜ 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
𝑠𝑠𝑠𝑠𝑠𝑠 52
80𝑠𝑠𝑠𝑠𝑠𝑠 60
2
(b) Shortest distance from R to KN
S .d =
2
A = 2000 𝑠𝑠𝑠𝑠𝑠𝑠60°
A = 1732.050808
∴ 𝑨𝑨 = πŸπŸπŸπŸπŸπŸπŸπŸπ’Žπ’ŽπŸπŸ Ans
𝑛𝑛 = 87.92016097
∴ 𝐊𝐊𝐊𝐊 = πŸ–πŸ–πŸ–πŸ–. πŸ—πŸ— 𝐦𝐦 Ans
Sd =
1
A = (50)(80) sin 60°
𝑠𝑠𝑠𝑠𝑠𝑠 52
2𝐴𝐴
𝑏𝑏
πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘
πŸ–πŸ–πŸ–πŸ–
= πŸ’πŸ’πŸ’πŸ’. πŸ–πŸ–πŸ–πŸ– Ans
(c) Graph of 𝑦𝑦 = cos πœƒπœƒ
0°
1
πœƒπœƒ
cos πœƒπœƒ
90°
0
1
0°
90°
180°
−1
270°
0
360°
1
π’šπ’š = 𝐜𝐜𝐜𝐜𝐜𝐜 𝜽𝜽
180°
270°
360°
−1
2. (a) (i)
𝑏𝑏
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
𝑏𝑏
=
=
𝑐𝑐
𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
15
𝑠𝑠𝑠𝑠𝑠𝑠 79
𝑠𝑠𝑠𝑠𝑠𝑠 40
15 𝑠𝑠𝑠𝑠𝑠𝑠 79
𝑏𝑏 =
𝑠𝑠𝑠𝑠𝑠𝑠 40
𝑏𝑏 = 22.9
AC = 22.9km Ans
(b) 𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐 = 0.937
πœƒπœƒ = (𝑐𝑐𝑐𝑐𝑐𝑐 −1 (0.937)
πœƒπœƒ = 20.4°
(ii) first find angle BAC
Angle BAC = 180 − (79 + 40) = 61
1
𝐴𝐴 = 𝑏𝑏𝑏𝑏 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
2
1
(iii) S.d =
2×150
22.9
= 13.100
= 13.1 Ans
𝐴𝐴 = (15)(22.9)𝑠𝑠𝑠𝑠𝑠𝑠61°
2
𝐴𝐴 = 150.2159349
𝑨𝑨 = πŸπŸπŸπŸπŸπŸπŸπŸπ’Žπ’ŽπŸπŸ Ans
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 56 of 84
πœƒπœƒ = 360° − 20.4) = 339.4
∴ 𝜽𝜽 = 𝟐𝟐𝟐𝟐. πŸ’πŸ’ 𝐚𝐚𝐚𝐚𝐚𝐚 𝜽𝜽 = πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘. πŸ’πŸ’ Ans
(c) π’šπ’š = 𝒔𝒔𝒔𝒔𝒔𝒔 𝜽𝜽
0°
0
πœƒπœƒ
Sin πœƒπœƒ
90°
1
180°
0
270°
-1
360°
0
1
0
90
180
270
360
𝑦𝑦 = sin πœƒπœƒ
−1
1
3. (a) (i) A = 𝑑𝑑𝑑𝑑 sin 𝐻𝐻
2
(iii) Shortest distance =
1
=
𝐴𝐴 = × 1.3 × 1.9 𝑠𝑠𝑠𝑠𝑠𝑠130°
2
h2 = (1.3)2 + (1.9)2 − 2(1.3)(1.9)cos130°
h = 5.3 – ( −3.175370792)
πœƒπœƒ =
2
h = 5.3 + 3.17537
h2 = 8.475370792
P
(ii)
οΏ½ = 180° − (46° + 36°)
R
r
=
=
sinP
p
sin 46°
36.5
rsin 46° = 36.5 sin98°
r=
36.5 sin 98°
sin 46°
1
A = × p × r × sin Q
2
1
= × 36.5 × 50.2 × sin 36°
2
= 98°
r
sin 98°
3
2
cos −1 οΏ½ οΏ½
3
P
2
sin R
2
πœƒπœƒ = 48.1896851
∴ πœƒπœƒ = 48.2° Ans
P
∴
2.9
(b) cos πœƒπœƒ =
2
4. (a) (i) to find PQ, first find angle R
𝑏𝑏
2×0.95
= 0.65517
S.d = 𝟎𝟎. πŸ”πŸ”πŸ”πŸ”πŸ”πŸ” 𝐀𝐀𝐀𝐀 Ans
A = 1.235 sin 130°
A = 0.946
A = 𝟎𝟎.946 km2 Ans
(ii) β„Ž2 = 𝑑𝑑 2 + 𝑠𝑠 2 − 2𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑
h = √8.475370792
h = 2.911249009
∴ 𝐓𝐓𝐓𝐓 = 𝟐𝟐. πŸ—πŸ—πŸ—πŸ—πŸ—πŸ—πŸ—πŸ— Ans
2𝐴𝐴
= 916.15 sin 36°
∴ A = 538.4994589 ≈ πŸ“πŸ“πŸ“πŸ“πŸ“πŸ“. πŸ“πŸ“ 𝐀𝐀𝐦𝐦𝟐𝟐 Ans
(iii) Shortest distance =
(b) sinπœƒπœƒ = 0.6792
2𝐴𝐴
𝑏𝑏
=
2×538..2
50.2
= 𝟏𝟏𝟏𝟏. πŸ•πŸ• 𝐀𝐀𝐀𝐀 A
πœƒπœƒ = sin−1 (0.6792) → press shift / 2nd f and then sin
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 57 of 84
r = 50.24716343
∴ 𝐏𝐏𝐏𝐏 = πŸ“πŸ“πŸ“πŸ“. 𝟐𝟐𝟐𝟐𝟐𝟐 Ans
5. (a) (i) k2 = i2 + m2 – 2imcos K
2
2
2
k = 5 + 3 −2(5)(3) cos110°
2=
k 34 – (- 10.2606043)
k2 = 44.26060643
πœƒπœƒ = 42.8° and πœƒπœƒ = 180 − 42.8 = 137.2°
∴ 𝜽𝜽 = πŸ’πŸ’πŸ’πŸ’. πŸ–πŸ–°, 𝟏𝟏𝟏𝟏𝟏𝟏. 𝟐𝟐° Ans
1
(ii) A = × π‘–π‘– × π‘šπ‘š 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠
1
2
(iii) shortest d =
A = (5)(3 )𝑠𝑠𝑠𝑠𝑠𝑠110°
2
A = 7.5 sin110°
A = 7.047694656
A = πŸ•πŸ•. 𝟎𝟎𝟎𝟎𝟎𝟎𝐦𝐦𝟐𝟐 Ans
k = √44.26060643
k = 6.656864368
∴ 𝐌𝐌𝐌𝐌 = πŸ”πŸ”. πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”πŸ” Ans
=
2𝐴𝐴
𝑏𝑏
2×7.05
6.65
= 𝟐𝟐. 𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏 Ans
(b) tanπœƒπœƒ = 0.7
πœƒπœƒ = tan−1 (0.7)
πœƒπœƒ = 34.9920202
πœƒπœƒ = 34.9920202
𝛉𝛉 = πŸ‘πŸ‘πŸ‘πŸ‘° Ans
TOPIC 11: MENSURATION
1.
𝐻𝐻
𝐻𝐻−11.4
=
14
8
14( H – 11.4) = 8H
14H − 159.6 = 8H
14H – 8H = 159.6
2.
6H = 159.6
H = 26.6
h = 26.6 – 11.4 = 15.2 cm
𝐻𝐻
𝐻𝐻−9
=
10
4
10(H − 9) = 4H
10H−90 = 4H
10H−4H = 90
6H = 90
H = 15
∴ 𝐻𝐻 = 15𝑐𝑐𝑐𝑐 π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž β„Ž = 15 − 9 = 6𝑐𝑐𝑐𝑐
1
∴ 𝑉𝑉 = (𝐿𝐿𝐿𝐿𝐿𝐿 − π‘™π‘™π‘™π‘™β„Ž)
3
1
𝑉𝑉 = (14 × 10 × 26.6 − 8 × 4 × 15.6)
3
1
𝑉𝑉 = (3724 − 486.4)
𝑉𝑉 =
3
1
3
(3237.6)
V = 1079.2
V = 1080 πœπœπœπœπŸ‘πŸ‘ Ans
1
∴ V = [𝐿𝐿2 𝐻𝐻 − 𝑙𝑙 2 β„Ž] (square base)
3
1
V = [102 × 15 − 42 × 6]
3
1
V = (1500 − 96)
1
3
V = (1404)
3
V = 468 π’„π’„π’Žπ’ŽπŸ‘πŸ‘ Ans
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 58 of 84
3. First find the height of the small cone that was
7
=
20+β„Ž
V=
21β„Ž = 140 + 7β„Ž
(13230 − 490)
3
3.142
3
(212 × 30 − 72 × 10)
(12740)
1
1
V= πœ‹πœ‹πœ‹πœ‹2 𝐻𝐻 − πœ‹πœ‹πœ‹πœ‹ 2 β„Ž
12
3
1
3
V = πœ‹πœ‹(𝑅𝑅 𝐻𝐻 − π‘Ÿπ‘Ÿ 2 β„Ž)
12π‘₯π‘₯ = 4(15 +π‘₯π‘₯)
3
1
2
V = × 3.142(122 × 22.5 − 42 × 7.5)
12π‘₯π‘₯ = 60 +4π‘₯π‘₯
3
12π‘₯π‘₯ −4π‘₯π‘₯ =60
V=
8π‘₯π‘₯ = 60
V=
π‘₯π‘₯ = 7.5
∴ 𝐀𝐀𝐀𝐀 = πŸ•πŸ•. πŸ“πŸ“ And AD = 7.5 +15 = 22.5cm
1cm3 → 1000𝑙𝑙
10.8cm3→ π‘₯π‘₯
π‘₯π‘₯ = 10.8 × 1000𝑙𝑙
π‘₯π‘₯ = 10800𝑙𝑙
∴ 𝑽𝑽 = 𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏 (3 sig fig)
3
3.142
(ii) Volume that remained is the that of the frustum
15+π‘₯π‘₯
5. (a) V = π‘™π‘™π‘™π‘™β„Ž
V= 1.2× 0.9 × 10
V= 10.8cm3
3
V = 13343.02667
V = πŸπŸπŸπŸπŸπŸπŸπŸπŸπŸπ’„π’„π’„π’„πŸ‘πŸ‘ Ans
4. (i) Let height EA = π‘₯π‘₯, then
=
1
3
3.142
V=
21β„Ž −7β„Ž = 140
14β„Ž= 140
β„Ž= 10
𝒉𝒉 = 𝟏𝟏𝟏𝟏 𝒄𝒄𝒄𝒄 and H = 10 + 20 = 30cm
4
1
V=
21
21β„Ž = 7(20+β„Ž)
π‘₯π‘₯
3
V = πœ‹πœ‹(𝑅𝑅 2 𝐻𝐻 − π‘Ÿπ‘Ÿ 2 β„Ž)
Cutoff.
β„Ž
1
∴ 𝑉𝑉 = πœ‹πœ‹π‘…π‘…2 𝐻𝐻 − πœ‹πœ‹π‘Ÿπ‘Ÿ 2 β„Ž
3.142
3
3.142
3
(3240 − 120)
(3120)
V = 3267.68
V = 3270 π’„π’„π’Žπ’ŽπŸ‘πŸ‘ (correct to 3 sig figures)
(b) first find the radius of a cone
r2= 132 − 122
r2 = 25
r = √25
r = 5cm
∴ 𝑇𝑇. 𝑆𝑆. 𝐴𝐴 = πœ‹πœ‹π‘Ÿπ‘Ÿ 2 + πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹
T.S.A = πœ‹πœ‹πœ‹πœ‹(π‘Ÿπ‘Ÿ + 𝑙𝑙)
T.S.A = 3.142 × 5(5 + 13)
T. S. A = 282.78cπ’Žπ’ŽπŸπŸ
12
Great works are performed not by strength but by perseverance
Compiled and Solved by Kachama Dickson C & Chansa John
13
r
/ Together we can do Mathematics /0966-295655
Page 59 of 84
(Kachama Dickson.C)
TOPIC 9: EARRTH GEOMETRY
N
1. (a)
B
A
35° N
15°N
0°
70°E
C
35°π‘†π‘†
40°E
SA
S
πœƒπœƒ
AC =
AC =
AC =
360
50°
× 2πœ‹πœ‹πœ‹πœ‹ where πœƒπœƒ = 15° + 35° = 50°
× 2 × 3.142 × 6370
360°
2001454
360
AC = 5,559.594444
AC = 5,560km Ans
(b) (i) BQ =
900 =
𝛼𝛼
(ii) longitude of Q = 70° − 9.9° = 60.1°
× 2πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹
360
2πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹
∴ position of Q (πŸ‘πŸ‘πŸ‘πŸ‘°π‘Ίπ‘Ί, πŸ”πŸ”πŸ”πŸ”. 𝟏𝟏°π‘¬π‘¬) Ans
360
2πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹ = 900 × 360°
𝛼𝛼 =
𝛼𝛼 =
32400
2πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹
32400
(2×3.142×6370 ×cos 35°)
𝛼𝛼 = 9.88109
∴ the difference in longitude is 9.9°
2. (a) D =
D=
D=
πœƒπœƒ
× 2πœ‹πœ‹πœ‹πœ‹ where πœƒπœƒ = 60° + 60° = 120°
360
120
× 2 × 3.142 × 3437
360
2591772 .96
or D = πœƒπœƒ × 60
D = 120° × 60
D = πŸ•πŸ•πŸ•πŸ•πŸ•πŸ•πŸ•πŸ• nm Ans
360
D = 7199.369333
∴ 𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝𝐝 𝐁𝐁𝐁𝐁 = 7200nm Ans
(b)
To find speed, first find distance CD
D=
D=
D=
𝜢𝜢
πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘
120
× πŸπŸπŸπŸπŸπŸπŸπŸπŸπŸπŸπŸπŸπŸ
× 2 × πœ‹πœ‹ × 3437 cos 60
360
𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏.πŸ’πŸ’πŸ’πŸ’
πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘
∴ speed =
𝑫𝑫
speed =
𝑻𝑻
3600
12
speed = 300knots Ans
D = 3599.684667
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 60 of 84
D = 3600nm
3. (a) Difference in latitudes between W and Y
𝜽𝜽 = 80° + 30° = 𝟏𝟏𝟏𝟏𝟏𝟏°
(b) (i) XZ =
πœƒπœƒ
XZ =
(ii) YZ =
× 2πœ‹πœ‹πœ‹πœ‹
360
110°
360°
× 2 × 3.142 × 3437
XZ = 6599.421889
XZ = 6600nm Ans
QR =
165°
360°
πœƒπœƒ
360°
YZ =
× 2πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹ where 𝛼𝛼 = 15° + 105 = 120°
× 2 × 3.142 × 3437 × π‘π‘π‘π‘π‘π‘30°
360°
2244541 .224
360
YZ = 6234.836734
YZ =6230nm Ans
4. (i)
(ii)(a) Distance QR =
YZ =
𝛼𝛼
360°
120°
× 2πœ‹πœ‹πœ‹πœ‹ πœƒπœƒ = 80° + 85° = 165°
× 2 × 3.142 × 3437
QR = 9899.132833
QR =9900 nm Ans
5. (a) Difference in latitudes
θ = 50° + 70° = 𝟏𝟏𝟏𝟏𝟏𝟏°
(b) C = 2πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹
C = 21600 Cos 50°
C=13884.21237nm
C= 13900nm
(b) C = 2πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹πœ‹
C = 21600 Cos πœƒπœƒ
C = 21600× π‘π‘π‘π‘π‘π‘ 85°
C = 1882.564043
C =1900nm Ans
(c) AD =
πœƒπœƒ
× 2πœ‹πœ‹πœ‹πœ‹
360°
120°
AD =
360°
× 2 × 3.142 × 3437
AD = 7199.369333
AD = 7200nm Ans
Produced by Sir DK & Sir JC
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 61 of 84
TOPIC 13: QUADRATIC FUNCTIONS
1.
(ii) From part (i) we can see that
2. (a) (i) 𝑦𝑦 = π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 12π‘₯π‘₯ − (π‘₯π‘₯ 3 + π‘₯π‘₯ 2 − 12π‘₯π‘₯)
3
2
3
2
𝑦𝑦 = π‘₯π‘₯ + 10
𝑦𝑦 = π‘₯π‘₯ + π‘₯π‘₯ − 12π‘₯π‘₯ − π‘₯π‘₯ − π‘₯π‘₯ + 12π‘₯π‘₯
𝑦𝑦 = 0 ↔ π‘₯π‘₯ − π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž
when we draw this line on the
∴ 𝒙𝒙 = −πŸ’πŸ’, 𝒙𝒙 = 𝟎𝟎 and 𝒙𝒙 = πŸ‘πŸ‘
same graph using any points we have
Note that the values of π‘₯π‘₯ are the points where
𝒙𝒙 = −πŸ‘πŸ‘. πŸ•πŸ• ± 𝟏𝟏, 𝒙𝒙 = −𝟎𝟎. πŸ•πŸ• ± and
3
2
the curve 𝑦𝑦 = π‘₯π‘₯ + π‘₯π‘₯ − 12π‘₯π‘₯ meets the line 𝑦𝑦 = 0
𝒙𝒙 = πŸ‘πŸ‘. πŸ“πŸ“ ± 𝟏𝟏
𝒙𝒙
−3
0
2
3
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 62 of 84
7
π’šπ’š
2. (b)(i) Draw a straight line touching only
at ( -3, 18) and pick any two points
lying on the same line
π‘šπ‘š =
π‘šπ‘š =
12
13
(ii) From the graph, we can see that the
required area is simply the areas
of the two trapeziums
e. g (−3, 18 ) and (−4.5,4)
π‘šπ‘š =
10
𝑦𝑦2 −𝑦𝑦1
π‘₯π‘₯ 2 −π‘₯π‘₯ 1
4−18
−4.5−(−3)
−14
−1.5
π’Žπ’Ž = πŸ—πŸ—. πŸ‘πŸ‘ ± 𝟏𝟏
1
A = (π‘Žπ‘Ž + 𝑏𝑏)β„Ž
2
1
2
1
2
1
A = (58) + (52)
2
2
A = 29 + 26
𝐀𝐀 = πŸ“πŸ“πŸ“πŸ“ ± 𝟏𝟏 Square units
3. (a) (i) 𝑦𝑦 = π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3 − (π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3)
𝑦𝑦 = π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3 − π‘₯π‘₯ 3 − 3π‘₯π‘₯ 2 + π‘₯π‘₯ + 3
𝑦𝑦 = 0
On the graph, when 𝑦𝑦 = 0, (π‘₯π‘₯ − π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž)
𝒙𝒙 = −πŸ‘πŸ‘, 𝒙𝒙 = −𝟏𝟏 and 𝒙𝒙 = 𝟏𝟏
(ii) 𝑦𝑦 = π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3 − (π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 5)
𝑦𝑦 = π‘₯π‘₯ 3 + 3π‘₯π‘₯ 2 − π‘₯π‘₯ − 3 − π‘₯π‘₯ 3 − 3π‘₯π‘₯ 2 + π‘₯π‘₯ + 5)
𝑦𝑦 = −3 + 5
1
A = (28 + 30)1 + (30 + 22)1
(b) (i) to find the gradient, draw a
straight line touching the curve
only at (−3,0) and pick any
two points lying on this line
for Example (−3,0) and (−2,8)
π‘šπ‘š =
π‘šπ‘š =
𝑦𝑦2 −𝑦𝑦1
π‘₯π‘₯ 2 −π‘₯π‘₯ 1
8−0
−2−(−3)
πŸ–πŸ–
π’Žπ’Ž = = πŸ–πŸ– Ans
𝟏𝟏
(ii) Area = A of rectangle + trapezium
𝑦𝑦 = 2
On the graph when y=2, then
𝒙𝒙 = −𝟐𝟐. πŸ”πŸ”, 𝒙𝒙 = −𝟏𝟏. πŸ“πŸ“ and 𝒙𝒙 = 𝟏𝟏. 𝟐𝟐 Ans
1
A = l× π‘π‘ + (π‘Žπ‘Ž + 𝑏𝑏)β„Ž
2
1
A = 1 × 20 + (20 + 5)
2
A = 20 + 12.5
A = 32.5 square units
4. (a) To find the gradient of the curve, simply draw a straight line touching the curve at (2,5)
and pick any two points lying on the line drawn, for example (2,5) and (1, −7) and use the
gradient formula to find the gradient
𝑦𝑦2 − 𝑦𝑦1
π‘šπ‘š =
π‘₯π‘₯2 − π‘₯π‘₯1
−7 − 5
π‘šπ‘š =
1−2
−12
π‘šπ‘š =
−1
π’Žπ’Ž = 𝟏𝟏𝟏𝟏 Ans
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 63 of 84
4. (b) (i) π’šπ’š = π‘₯π‘₯3 + π‘₯π‘₯2 − 5π‘₯π‘₯ + 3 − (π‘₯π‘₯3 + π‘₯π‘₯2 − 5π‘₯π‘₯ + 3)
π’šπ’š = π‘₯π‘₯3 + π‘₯π‘₯2 − 5π‘₯π‘₯ + 3 − π‘₯π‘₯3 − π‘₯π‘₯2 + 5π‘₯π‘₯ − 3
𝑦𝑦 = 0
On the graph, when 𝑦𝑦 = 0(π‘₯π‘₯ − π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž)
𝒙𝒙 = −πŸ‘πŸ‘ and 𝒙𝒙 = 𝟏𝟏 Ans
(c) From the graph in the given bounds, we can
make two trapeziums.
Hence to find the area, we find the total areas of these
two trapeziums:
1
A = (𝒂𝒂 + 𝒃𝒃)𝒉𝒉
2
1
(ii) similarly we have 𝑦𝑦=5π‘₯π‘₯
Use any points to draw the
line 𝑦𝑦 = 5π‘₯π‘₯ and find the
values of x where it meets
the curve for example use
the points in this table
below
π‘₯π‘₯ -1
0
1
5
𝑦𝑦 -5
0
5
10
∴ 𝒙𝒙 = −πŸ‘πŸ‘. πŸ–πŸ–, 𝒙𝒙 = 0.3 and 𝒙𝒙=𝟐𝟐. πŸ’πŸ’
1
A= (9 + 8)1 + (8 + 3)
2
1
1
2
A= (17) + (11)
2
2
A= 8.5 + 5.5
A= 𝟏𝟏𝟏𝟏 Square units
Why should you fail mathematics when success
is guaranteed .
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 64 of 84
5.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 65 of 84
TOPIC 14: LINEAR PROGRAMING
1.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 66 of 84
2.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 67 of 84
3.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 68 of 84
4.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 69 of 84
5.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 70 of 84
TOPIC 15: STATISTICS
1. (a)
class
𝒙𝒙
π’™π’™πŸπŸ
𝒇𝒇
10< π‘₯π‘₯ ≤ 20
15
225
20 < π‘₯π‘₯ ≤ 30
25
625
10
250
6250
30 < π‘₯π‘₯ ≤ 40
35
1225
15
525
18375
45
2025
23
1035
46575
50 < π‘₯π‘₯ ≤ 60
55
3025
30
1650
90750
65
4225
10
1650
42250
40< π‘₯π‘₯ ≤ 50
60 < π‘₯π‘₯ ≤ 70
Totals
Mean π‘₯π‘₯Μ… =
=
=οΏ½
οΏ½ 𝒇𝒇 = πŸ—πŸ—πŸ—πŸ—
30
οΏ½ 𝒇𝒇𝒇𝒇 = πŸ’πŸ’πŸ’πŸ’πŸ’πŸ’πŸ’πŸ’
450
π’‡π’‡π’™π’™πŸπŸ
οΏ½ π’‡π’‡π’™π’™πŸπŸ = 𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐
∑ 𝑓𝑓𝑓𝑓
∑ 𝑓𝑓
4140
90
= 46
∑ 𝑓𝑓𝑓𝑓 2
SD = οΏ½ ∑
2
𝒇𝒇𝒇𝒇
𝑓𝑓𝑓𝑓
− (π‘₯π‘₯)2
204650
90
− (46)2
= √2273.888889 − 2116
= √157.8888889
SD = 12.57 Ans
Get your copy today and enjoy studying mathematics
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 71 of 84
(b)
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 72 of 84
2. (a)
2
𝒙𝒙
π’™π’™πŸπŸ
4
3
9
4
𝒇𝒇
1
2
𝒇𝒇𝒇𝒇
4
5
15
45
16
4
16
64
5
25
6
30
150
6
36
10
60
360
7
49
16
112
784
8
64
18
144
1152
οΏ½ 𝒇𝒇 = πŸ”πŸ”πŸ”πŸ”
οΏ½) =
Mean ( 𝒙𝒙
∑ 𝑓𝑓𝑓𝑓
SD = οΏ½ ∑
𝑓𝑓
60
οΏ½ π’‡π’‡π’™π’™πŸπŸ = 𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐
∑ 𝒇𝒇𝒇𝒇
∑ 𝒇𝒇
=
πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘
πŸ”πŸ”πŸ”πŸ”
= πŸ”πŸ”. πŸ‘πŸ‘πŸ‘πŸ‘
− (π‘₯π‘₯Μ… )2
2559
=οΏ½
οΏ½ 𝒇𝒇𝒇𝒇 = πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘πŸ‘
π’‡π’‡π’™π’™πŸπŸ
− (6.32)2
= √42.65 − 39.9424
= √2.7076
= 1.645478654
= 𝟏𝟏. πŸ”πŸ”πŸ”πŸ” Ans
Hard work need to be appreciated.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 73 of 84
Get your own copy direct from the Authors and avoid Piracy
(b)
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 74 of 84
3. (a)
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 75 of 84
Class marks
0 < π‘₯π‘₯ ≤ 5
5 < π‘₯π‘₯ ≤ 10
10 < π‘₯π‘₯ ≤ 15
15 < π‘₯π‘₯ ≤ 20
20 < π‘₯π‘₯ ≤ 25
25 < π‘₯π‘₯ ≤ 30
οΏ½=
𝒙𝒙
=
𝒙𝒙
2.5
7.5
12.5
17.5
22.5
27.5
∑ 𝑓𝑓𝑓𝑓
13
27
35
16
7
2
𝒇𝒇
οΏ½ 𝑓𝑓 = 100
𝒇𝒇𝒇𝒇
32.5
205.5
437.5
280
157.5
55
οΏ½ 𝑓𝑓𝑓𝑓 = 1168
�)𝟐𝟐
(𝒙𝒙 − 𝒙𝒙
12.25
17.2225
0.7225
34.2225
117.7225
251.2225
�)𝟐𝟐
𝒇𝒇(𝒙𝒙 − 𝒙𝒙
159.25
465.0
25.288
547.58
824.058
502.445
οΏ½ 𝑓𝑓(π‘₯π‘₯ − π‘₯π‘₯Μ… )2
= 2523.621
∑ 𝑓𝑓
1165
100
= 𝟏𝟏𝟏𝟏. πŸ”πŸ”πŸ”πŸ”
SD = οΏ½
∑ 𝒇𝒇(𝒙𝒙−𝒙𝒙
�)𝟐𝟐
∑ 𝒇𝒇
𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐.πŸ”πŸ”πŸ”πŸ”πŸ”πŸ”
SD = οΏ½
𝟏𝟏𝟏𝟏𝟏𝟏
SD = √𝟐𝟐𝟐𝟐. 𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐
SD = 5 .023565467
SD = πŸ“πŸ“ Ans
Great works are done not by hardworking, but by persistence and perseverance
(b)
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 76 of 84
4. (a)
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 77 of 84
Class marks
Midpoints
(π‘₯π‘₯)
Frequency
(𝑓𝑓)
30 < π‘₯π‘₯ ≤ 35
32.5
4
40 < π‘₯π‘₯ ≤ 45
42.5
25 < π‘₯π‘₯ ≤ 30
35 < π‘₯π‘₯ ≤ 40
45 < π‘₯π‘₯ ≤ 50
55 < π‘₯π‘₯ ≤ 55
55 < π‘₯π‘₯ ≤ 60
Totals
οΏ½) =
Mean (𝒙𝒙
47.5
52.5
57.5
𝑓𝑓𝑓𝑓 2
5
137.5
756.25
3781.25
7
262.5
1406.25
9843.75
11
12
8
1
οΏ½ 𝑓𝑓 = 48
130
467.5
570
420
57.5
οΏ½ 𝑓𝑓𝑓𝑓 = 2045
1056.25
1806.25
2256.25
2256.25
3306.25
4225
19868.75
27075
22050
3306.25
οΏ½ 𝑓𝑓π‘₯π‘₯ 2 = 90150
∑ 𝒇𝒇𝒇𝒇
∑ 𝒇𝒇
πŸ’πŸ’πŸ’πŸ’
= 42 .6
∑ fx 2
∑f
90150
=οΏ½
37.5
π‘₯π‘₯ 2
𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐
=
SD = οΏ½οΏ½
27.5
𝑓𝑓𝑓𝑓
48
− (xοΏ½ )2 οΏ½
− (42.6)2
= √1878.125 − 1814.76
= √63.365
=πŸ•πŸ•. πŸ—πŸ—πŸ—πŸ— 𝐀𝐀𝐀𝐀𝐀𝐀
Get your own copy direct from the Authors in Mufulira/Kitwe
(b)
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 78 of 84
5. (a)
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 79 of 84
Class marks
0 < π‘₯π‘₯ ≤ 10
5
30 < π‘₯π‘₯ ≤ 40
35
10 < π‘₯π‘₯ ≤ 20
20 < π‘₯π‘₯ ≤ 30
40 < π‘₯π‘₯ ≤ 50
50 < π‘₯π‘₯ ≤ 60
Mean, π‘₯π‘₯Μ… =
=
15
𝒙𝒙
25
45
55
7
22
𝒇𝒇
28
23
15
5
οΏ½ 𝒇𝒇 = 𝟏𝟏𝟏𝟏𝟏𝟏
35
330
𝒇𝒇𝒇𝒇
700
805
675
275
οΏ½ 𝒇𝒇𝒇𝒇 = 𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐
25
π’™π’™πŸπŸ
225
625
1225
2025
3025
fπ’™π’™πŸπŸ
175
4950
17500
28175
30375
15125
οΏ½ 𝒇𝒇 π’™π’™πŸπŸ = πŸ—πŸ—πŸ—πŸ—πŸ—πŸ—πŸ—πŸ—πŸ—πŸ—
∑ 𝑓𝑓𝑓𝑓
∑ 𝑓𝑓
2820
100
= 28.2
∴ 𝑆𝑆𝑆𝑆 = οΏ½
∑ 𝑓𝑓 π‘₯π‘₯ 2
− (π‘₯π‘₯Μ… )2
∑ 𝑓𝑓
96300
SD = οΏ½
100
− (28.2)2
SD = √963 − 795.24
SD = √167.76
SD = 12.95221989
SD = 𝟏𝟏𝟏𝟏. 95 Ans
(b)
Get your own copy direct from Mr. Kachama D (Mufulira) and Mr. Chansa. J (Kitwe)
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 80 of 84
TOPIC 16: TRANSFORMATION
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 81 of 84
1. (a) It is a clockwise rotation of 90° about the origin.
(b) It is an enlargement, centre (0, 0) and scale factor 2
(c) Let the matrix be οΏ½
π‘Žπ‘Ž
𝑐𝑐
𝑏𝑏
οΏ½, then pick any two coordinates of P which corresponds to V and
𝑑𝑑
form four equations as follows:
οΏ½
π‘Žπ‘Ž
𝑐𝑐
𝑏𝑏 2
οΏ½οΏ½
𝑑𝑑 1
4
−4
οΏ½=οΏ½
1
4
−8
οΏ½
1
π‘Žπ‘Ž + 4𝑏𝑏 = −4 …………………….(i)
π‘Žπ‘Ž + 𝑏𝑏 = −8 ……………………(ii)
2𝑐𝑐 + 𝑑𝑑 = 1……………….(iii)
4𝑐𝑐 + 𝑑𝑑 = 1………………….(iv)
Solving these equations (i) and (ii) simultaneously, we have π‘Žπ‘Ž = −2 π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž 𝑏𝑏 = 0
Similarly solving equations (iii) and (iv) we have 𝑐𝑐 = 0 and 𝑑𝑑 = 1
∴ the required matrix is
οΏ½
𝒂𝒂
𝒄𝒄
−𝟐𝟐
𝒃𝒃
οΏ½=οΏ½
𝟎𝟎
𝒅𝒅
𝟎𝟎
οΏ½
𝟏𝟏
(d) To find the coordinates of S, we need multiply the given matrix by the coordinates of P.
1 0 2 2 4
οΏ½οΏ½
οΏ½
−2 1 1 4 1
2+0
2+0
4+0
οΏ½
οΏ½
−4 + 1 −4 + 4 −8 + 1
𝟐𝟐 𝟐𝟐 πŸ’πŸ’
οΏ½
οΏ½
−πŸ‘πŸ‘ 𝟎𝟎 −πŸ•πŸ•
οΏ½
There the coordinates of S are (𝟐𝟐, −πŸ‘πŸ‘), (𝟐𝟐, 𝟎𝟎)and (πŸ’πŸ’, −πŸ•πŸ•)
Your life is in your hands, to make of it what you choose
2.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 82 of 84
3.
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 83 of 84
4.
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Page 84 of 84
Compiled and Solved by Kachama Dickson C & Chansa John
/ Together we can do Mathematics /0966-295655
Page 85 of 84
5. (a) (i) To find the centre of enlargement, join any corresponding two points of the
object and the image, the intersection point is the centre of enlargement.
∴ the centre of enlargement is (1, 2) Ans
(ii)
Scale factor =
π‘Žπ‘Ž
𝑐𝑐
𝑏𝑏 1
οΏ½οΏ½
𝑑𝑑 4
π‘Žπ‘Ž
𝑐𝑐
= 𝟐𝟐 Ans
𝑏𝑏
οΏ½, then
𝑑𝑑
1 3
3
οΏ½=οΏ½
οΏ½
1 5
4
(b) Let the matrix be οΏ½
οΏ½
3.2
1.6
π‘Žπ‘Ž + 4𝑏𝑏 = 1 …………….(i)
𝑐𝑐 + 4𝑑𝑑 = 1 …………………..(iii)
3π‘Žπ‘Ž + 4𝑏𝑏 = 3 …………….(ii)
3𝑐𝑐 + 4𝑑𝑑 = 5…………………..(iv)
Solving the equations (i) and (ii) simultaneously yields π‘Žπ‘Ž = 1 π‘Žπ‘Žπ‘Žπ‘Žπ‘Žπ‘Ž 𝑏𝑏 = 0.
Similarly solving equations (iii) and (iv) simultaneously yields 𝑐𝑐 = 2 and 𝑑𝑑 = −
∴ the required matrix is οΏ½
π‘Žπ‘Ž
𝑐𝑐
𝟏𝟏 𝟎𝟎
𝑏𝑏
οΏ½ = �𝟐𝟐 − 𝟏𝟏� Ans
𝑑𝑑
πŸ’πŸ’
1
4
(c) Triangle ABC is mapped onto triangle 𝐀𝐀 πŸ‘πŸ‘ πππŸ‘πŸ‘ π‚π‚πŸ‘πŸ‘ by an anticlockwise rotation of 90°
about (0, 0) or by a clockwise rotation of 270° about (0, 0).
(d) (i)
(ii)
Comparing the matrices οΏ½
π‘˜π‘˜
0
−3
0
οΏ½ and οΏ½
0
1
0
οΏ½, we have π‘˜π‘˜ = −3
1
∴ the scale factor of this transformation is π’Œπ’Œ = −πŸ‘πŸ‘ Ans
To find the coordinates of A4, B4 and C4 (image) we need to multiply the given
matrix with the coordinates of triangle ABC (object)
−3 0 1 3 1
οΏ½οΏ½
οΏ½
0 1 4 4 5
−3 + 0 −9 + 0 −3 + 0
οΏ½
οΏ½
0+4
0+4
0+5
−3 −9 −3
οΏ½
οΏ½
4
4
5
οΏ½
∴ the coordinates of 𝐀𝐀 πŸ’πŸ’, πππŸ’πŸ’ and π‚π‚πŸ’πŸ’ are (−πŸ‘πŸ‘, πŸ’πŸ’), (−πŸ—πŸ—, πŸ’πŸ’) and (−πŸ‘πŸ‘, πŸ“πŸ“)
respectively
THE END OF SOLUTIONS TO ALL QUESTIONS: ENJOYOUR REVISION & GOD BLESS YOU!!!!!!
Compiled and Solved by Kachama Dickson C & Chansa John / Together we can do Mathematics /0966-295655
Download