# 

```Math 142 Exam 3 Review
1. Find each antiderivative:
a)
c)
e)

2
x (x
12 x
2
2
 5 x ) dx
8
 x3  2x  9
e
x
dx
x

b)
2
 ( e x  2 x  1) 1 3 dx
 7x
3 2
 10
dx
x
x
e

d)
2
dx
x
x3
 ( x  4 ) 2 dx
f)
2. A marginal average cost function is
MAC  0 . 3 
500
x
2
. The average cost per unit if 50
units are produced is \$72. Find the total cost function.
3. Find y(t) if a)
b)
dy
dt
dy
dt
 (t

2
 2 )e
1
3
t  6t
for t  1
1 t
y (0)  4
y (0)  5
4. Find the left and right hand Riemann sums with n equal subintervals.
x
a)
f ( x )  16
b)
f (x)  4  x
c)
f (x)  5x
5. Show that
on [1 , 2 ]
2
3
n 4
n 4
on [1 , 3 ]
on [ 0 , 2 ]
n 5
F ( x )  x ln x  x
is an antiderivative of f(x)= lnx and evaluate
C
 ln x dx .
1
2
6. a) Evaluate
 f ( x ) dx
7
 3

f ( x )  1 . 5 x  3
 4  x2

x  4
 4  x  2
2 x2
b) Find the total area between f(x) (from part a) and the x- axis for x between -7 and 2.
7. Evaluate each definite integral.
3
2
3
 Kx  Lx  dx
a)
1
8.
T
b)

ln A
x
x
2
 4 dx
0
x
f (x) 
x
2
1
c)

e
t
t
e  3 dt
0
Find the average value of f(x) on a) [0, 4]
b) [-4, 4]
9. A cost function is C(x)=15x+2500.
a) Find the average cost per unit if 50 units are produced.
b) Find the average value of the total cost on [0, 50].
10. f ( x )  2 x 3  7 x 2  9 x g ( x )  x 3  3 x 2  4 x
a) Find the area between f(x) and g(x).
b) Find the area between f(x) and g(x) for x between 1 and 6.
11. Find the consumer surplus and the producer surplus at equilibrium.
a)
D ( x )  25  0 . 1 x
b)
D (x) 
c)
D ( x )  50  0 . 1 x
S ( x )  10  0 . 5 x
400  0 . 2 x
S ( x) 
50  0 . 3 x
S ( x )  9  0 .1 x
```
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