A car rental company's standard chsrge includes an initial fee plus an additional fee for each mile driven the standard charge s in dollars is given by the function s=15.75+0.60M where M is the number of miles driven. The company offers an option to insure the car against damage the insurance change I in dollar is given by the function I=3.90 +0.25M let c be the total charge in dollars for a rental that includes insurance write an equation relationg C to M simplify your answer as much a possible

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