# The cost, in dollars, of a one-day car rental is given by C(x) = 31 + 0.18x, where x is the number of miles driven. In this function, A) $0.18 is the cost per day to rent the car and $31 is the cost per mile. B) $31 is the cost per day to rent the car and $0.18 is the cost per mile. C) $18 is the cost per day to rent the car and $0.31 is the cost per mile. D) $31 is the cost per day to rent the car and $18 is the extra cost for unlimited miles.

(1) Answers

B is the more obvious answer, since mileage cost tends to be a small price.

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