MA 15200 Midterm: Exam 3 Spring 2012 Solutions
Answers MA 15200 Exam 3 Spring 2012
Problem Form A Form B Actual Answer
1) C B I, II, and IV
(I am also counting the answer I, II, III, and IV. The textbook usually uses only open intervals
for increasing/decreasing; but some students may be confused about open versus closed
intervals.)
2) D A
( 2) 4, (4) 3ff
3) A D The function is increasing on
( 8,8).
4) C D
65
slope: , -intercept:
11 11
y
5) B C
21
33
yx
6) B C
52
3
yx
7) D D
8) C A
33
2
y
9) A B I and III only
10) A E
2
( ) and ( ) 4 2
4
x
f x g x x
11) C C $620.89
12) B E The graph will represent an increasing function.
13) D B
2
8
log 1
x
x
14) E D
25x
15) B B Between 3 and 3.5 pounds (about 3.17 lb.)
