Solve the problem.In the first two weeks of school, Jill studied 10 hours and 16 hours, respectively. How many hours must she study during the third week to give her an average of 20 hours per week?
A. 23 hours
B. 34 hours
C. 20 hours
D. 13 hours
Answer: B
Mathematics
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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. 3.5 hr C. 4.6 hr D. 0.2 hr
Mathematics
Solve the problem.The profit that the vendor makes per day by selling x pretzels is given by the function 
Find the number of pretzels that must be sold to maximize profit.
A. 700 pretzels B. 1.4 pretzels C. 350 pretzels D. 390 pretzels
Mathematics
Graph.y = ?7 - x?
A. 
B. 
C. 
D. 
Mathematics
Find the domain of the rational function.f(x) = 
A. 
B. 
C. 
D. 
Mathematics