Solve.The cost of renting a certain type of car is $40 per day plus $0.10 per mile. A linear function that expresses the cost C of renting a car for one day as a function of the number of miles driven x is 
What are the independent and dependent variables?
A. The independent variable is the number of days, x. The dependent variable is the cost C.
B. The independent variable is 40. The dependent variable is 0.10.
C. The independent variable is the cost, C. The dependent variable is the number of miles driven, x
D. The independent variable is the number of miles driven, x. The dependent variable is the cost C.
Answer: D
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