Rewrite the expression in terms of exponentials and simplify the results.ln 
+ ln (cosh 6x + sinh 6x)
A. -2
B. 14x
C. ln (e6x - e-8x)
D. -2x
Answer: D
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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. 2.3 hr B. 1.2 hr C. 1.7 hr D. 0.4 hr
Decide whether or not the given equation is an identity.sin2 ? - cos2 ? = 2 sin2 ? - 1
A. Yes B. No
Solve the problem.The number of births in County A has been increasing in recent years. Using the information given on the bar graph for the years 1960 and 1990, find an equation to model the number of births y for the year x. Let x = 0 correspond to the year 1960.
A. y = 
x - 2190
B. y = 
x + 1693
C. y = 
x + 1693
D. y = 
x + 
Complete.36 in. = 
ft
A. 108 B. 3 C. 12 D. 0.25