Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly with the area A of the enlargement. If 84 seconds are required to make a 3-by-4 enlargement, find the time required for a 
enlargement.
A. 336 sec
B. 378 sec
C. 252 sec
D. 294 sec
Answer: D
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Solve the problem.Let g(x) = 
. Find a function y = f(x) so that (f ? g)(x) = 
.
A. f(x) = 
B. f(x) = 
C. f(x) = x
D. f(x) = x2
Solve the problem.A company that produces radios has costs given by the function 
, where x is the number of radios manufactured and C(x) is measured in dollars. The average cost to manufacture each radio is given by
Find
(Round to the nearest dollar, if necessary.)
A. $40 B. $43 C. $175 D. $145
Evaluate as requested.Given that f(x) = 
, find f 
.
A. - 
B. 
C. 
D. - 
Solve the problem.The regular price of a blanket is $36.50. During a November sale, the blanket was selling for 20% off the regular price. What was the sale price of the blanket? Round to the nearest cent.
A. $29.20 B. $7.55 C. $29.45 D. $7.30