A gas station charges $1.55 per gallon for regular gasoline. Write an expression for the cost c(g) as a function of the number of gallons g and use this function to determine c(12). Match your results to the correct answer below.
A) c(g) = 1.55g ; c(12) = $20.15
B) ; c(12) = $18.60
C) c(g) = 1.55 + g ; c(12) = $13.55
D) c(g) = 1.55g ; c(12) = $18.60

Question

A gas station charges $1.55 per gallon for regular gasoline. Write an expression for the cost c(g) as a function of the number of gallons g and use this function to determine c(12). Match your results to the correct answer below.
A) c(g) = 1.55g ; c(12) = $20.15 
B) ; c(12) = $18.60 
C) c(g) = 1.55 + g ; c(12) = $13.55 
D) c(g) = 1.55g ; c(12) = $18.60

Quizplus · Accepted Answer

The correct expression for the cost c(g) is c(g) = 1.55g, since the cost is simply the price per gallon multiplied by the number of gallons. To find c(12), we substitute g = 12 into the expression, giving c(12) = 1.55(12) = $18.60. Therefore, the correct answer is D.

A Gas Station Charges $1