Solve the problem.A gas station sells 4820 gallons of regular unleaded gasoline in a day when they charge $1.35 per gallon, whereas they sell 3895 gallons on a day that they charge $1.40 per gallon. Find a linear function that expresses gallons sold as a function of price. Use this function to predict the number of gallons sold at a price of $1.28 per gallon.
A. 6111.7 gallons
B. 6115 gallons
C. 6124 gallons
D. 6119.1 gallons
Answer: B
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Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 160 seconds are required to make a 
enlargement, find the time required for a 
enlargement.
A. 504 sec B. 448 sec C. 392 sec D. 560 sec
Find the inverse of the function.f(x) = 
, x ? -3
A. f-1(x) = x2 - 9, x ? 0 B. f-1(x) = -x2 + 3, x ? 0 C. f-1(x) = x2 - 3, x ? 0 D. Not a one-to-one function
Graph the rational function.f(x) = 
A. 
B. 
C. 
D. 
Solve the problem.The first derivative of a person's body temperature, with respect to the dosage of x milligrams of a drug, is given by 
One milligram raises the temperature 3.2° C. Find the function D(x) giving the total change in temperature as a function of x.
A. D(x) = ln 
- 3.2
B. D(x) = 8 ln 
- 5.6
C. D(x) = ln 
+ 5.6
D. D(x) = 8 ln 
+ 3.2