Provide an appropriate response.
A rental car costs $20 for a day plus $0.25 per mile. Write a function that represents the cost of the car for a single day if x represents the number of miles and f(x) represents the car rental cost.
A. f(x) = 20x + 0.25
B. f(x) = 0.25x
C. f(x) = 0.25x + 20
D. f(x) = 20.25x
Answer: C
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