Solve the problem.The amount of alcohol in the bloodstream, A, declines at a rate proportional to the amount, that is, 
. If 
for a particular person, how long will it take for his alcohol concentration to decrease from 0.10% to 0.05%? Give your answer to the nearest tenth of an hour.
A. 1.7 hr
B. 0.4 hr
C. 2.3 hr
D. 1.2 hr
Answer: D
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Solve the problem.A museum curator collects fossils from two different periods. He has 500 from one period and 255 from a later period. He plans to arrange the fossils in display cases so that each case contains the same number of fossils. Also, each case must contain fossils from only one period. What is the largest number of fossils that can be placed in each case?
A. 255 B. 25,500 C. 500 D. 5
Solve the problem. If necessary, round your result to the nearest tenth unless instructed differently. The precise value of your approximation may depend on the conversion path that you choose.In a certain medium, sound travels at a speed of 7619 feet per second. How many meters per second does sound travel in this medium? Round to the nearest tenth.
A. 6933.3 m/s B. 24,990.3 m/s C. 2285.7 m/s D. 2971.4 m/s
Solve.47 - 3x = 
A. 
B. {8}
C. {3}
D. {-3}
The management of the Cambridge Company has projected the sales of its products (in millions of dollars) for the upcoming year, with the associated probabilities shown in the following table:
What does the management expect the sales to be next year?
a. 32.34
b. 15.34
c. 28.98
d. 29.61
e. 18.7