Find the reciprocal, if it exists.
A. - 
B. 3y
C. - 
D. -3y
Answer: D
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Solve.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 50 seconds are required to make a 5-by-5 enlargement, find the time required for a 6-by-7 enlargement.
A. 126 sec B. 42 sec C. 84 sec D. 168 sec
Solve the problem.In a state with a population of 3,000,000 people, the average citizen spends $6,000 on housing each year. What is the total spent on housing for the state? Write your answer in scientific notation.
A. $1.8 × 1010 B. $18 × 1010 C. $1.8 × 109 D. $18 × 1011
Find the indefinite integral of 
.
?
A. 
B. 
C. 
D. 
E. 
Solve.A person travels 15 miles in 
of an hour, then returns by traveling that same 15 miles in 
of an hour. What is that person's average rate?
A. 72 mph B. 62.5 mph C. 105 mph D. 6.25 mph