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The cost​ C, in​ dollars, of renting a moving truck for a day is given by the function Upper C left parenthesis x right parenthesis equals 0.25 x plus 40 comma where x is the number of miles driven.
​(a) What is the cost if a person drives x equals 240 ​miles?
​(b) If the cost of renting the moving truck is ​$180​, how many miles did the person​ drive?
​(c) Suppose that a person wants the cost to be no more than ​$150. What is the maximum number of miles the person can​ drive?