# Wits and Wagers Midterm Review - IB HL 2009 ```HL1 Midterm Exam Review
Given that f(x) = 2e3x, find the
inverse function f –1(x).
1  x
f ( x)  ln  
3 2
1
When the function
f (x) = 6x4 + 11x3 – 22x2 + ax + 6
is divided by (x + 1) the remainder is
–20. Find the value of a.
a=-1
 Twelve people travel in three cars with four people in
each car. Each car is driven by its owner. Find the
number of ways in which the remaining nine people
may be allocated to the cars. (The arrangement of
people within a particular car is not relevant.)
 When they arrive at their destination, the 12 people
must divide into 3 equal groups to go through the corn
maze. How many ways can they be assigned to
groups?
1680 ways
5775 ways
The function f is given by ln( x  2)
Find the domain of the function.
(No calculator!)
x3
a) Give the value of
1
tan (1).
2

b) Give the value of tan  arccos  .
3


a) 
4
b)
5
2
Determine the constant term in the
expansion of
2

x


2 
x 

9
-672
(z + 2i) is a factor of 2z3–3z2 + 8z – 12.
Find the other two factors.
(z-2i)(2z-3)
Solve the inequality.
3
x  4
x
2
–2.30 &lt; x &lt; 0 or l &lt; x &lt; 1.30
Exact: 1
 ( 13  1)  x  0 or
2
1
1  x  ( 13  1)
2
 The depth, y metres, of sea water in a bay t
hours after midnight may be represented
by a sinusoidal model.
 The water is at a maximum depth of 14.3 m
at midnight and noon, and is at a minimum
depth of 10.3 m at 06:00 and at 18:00.
 Write a function to model the depth and
use it to find the first time after noon when
the water is below 12 m.
 
EQ : y  2 cos  t   12.3
6 
t  15.3 (3 :18 pm)
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