Math 112 Final Exam Study Aid Worksheet With Answer Key Page 37
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39Math 112
Final Exam Study Aid
37 of 39
129. Solve for x :
log
x
log
(x
1) = 2
3
3
1
9
10
100
(A)
(B)
(C)
(D)
(E) None of these
8
8
9
99
0.015t
130. The number of California gray whales is growing according to the formula A = P e
,
where t is measured in years. How long will it take the number of whales to double?
(A) less than 40 years
(B) between 40 and 50 years
(C) between 50 and 60 years
(D) between 60 and 70 years
(E) more than 70 years
131. In 1980, the population of the United States was approximately 226.5 million people.
In 1990, the population had grown to approximately 246.7 million. Assuming an
rt
exponential growth model A = P e
, what is the projected population of the U.S. in
the year 2000?
(A) Less than 260 million
(B) Between 260 million and 265 million
(C) Between 265 million and 270 million
(D) Between 270 million and 275 million
(E) More than 275 million
132. Mr. Smart decided to invest $20,000 in a savings account. At what annual percentage
rate, compounded monthly, did he invest his money in order to have $36,500 at the
end of 10 years?
The interest rate is:
(A) less than 6.1%
(B) between 6.1% and 6.3%
(C) between 6.3% and 6.5% (D) between 6.5% and 6.7%
(E) greater than 6.7%
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