23.
[Probability]
28.
.
Three coins are tossed. Complete the tree
diagram below to illustrate all the possible
outcomes.
[Area]
*
Find the area of the shaded triangle below, given
that M is the midpoint of AB.
Start
,A
~
First coin
H
T
/"'"
Second coin
H
T
/\
Third coin H
/\
T
+
/"'"
H
H T
/\
c
T
/\
H TH T
29.
14 em 2
[Volume]
*
The water level in a public swimming pool has
fallen 4 cm due to evaporation. Use the pool
dimensions given below to work out how many
liters of water must be added to the pool to
restore the desired level.
[Hint: 1 L = 1000 em3]
25m
What is the probability of having two heads
and one tail?
24.
B
I
4cm
[Geometry]
1m
Find the value ofx.
2m
[All measurements are in em.]
7.5m
10,000 L
30.
[Surface Area]
*
Using S.A. = 41tr2 and 1t "'"
272,
find the surface
area of the sphere below.
2
3
25.
[Angles]
*
Find the value of xc.
154 in.2
31.
[Pythagorean
Theorem
/ Trigonometry]
*
Find the value of x, given cos e
~12
26.
[Measurement
32.
/Time]
[Problem
0.6 X
How many fe are there in an area of 720 in??
Solving
1]
= 0.4
30
*
0.125 -
0.25 X
0.1
5 ft2
33.
27.
[Perimeter]
*
Find the perimeter of the rectangle below.
4km
[Problem
2] *
A bricklayer knows from experience that no
more than 6% of any load of bricks is broken on
delivery. Since it is often not possible to
purchase exactly matching bricks at a later date,
it is important that the original order include
sufficient bricks for the job. If bricks can only
be ordered in lots of 100, and 8000 bricks are
required to finish the job, how many
bricks should the bricklayers order?
White 4.2
page 54
Solving
@ Copyright
Not to be reproduced without permission. J. B. Wright. Echuca 2004