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. 3.5 hr
C. 4.6 hr
D. 0.2 hr
Answer: A
Mathematics
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Solve the problem.Suppose you purchase a 10-year U.S. savings bond with an APR of 2.5%. The face value of the bond is $9000. Find the purchase price of the bond.
A. $7272.73 B. $7200 C. $7128.71 D. $7346.94 E. $7058.82
Mathematics
Write the sentence as a mathematical statement.Thirteen is less than or equal to fifteen.
A. 13 < 15 B. 13 ? 15 C. 13 ? 15 D. 13 ? 15
Mathematics
Complete the identity.
= ?
A. sec x - tan x + 1 B. sec x - tan x C. sec x + tan x D. -sec x - tan x
Mathematics
Add or subtract. Assume that variables represent nonnegative values.8
+ 7
A. 165
B. 15
C. 56
D. 15
Mathematics