A car rental company s standard charge includes an initial fee plus an additional fee for each mile driven The standard charge S in dollars is given by the function S 14 95 0 50M where M is the number of miles driven The company also offers an option to insure the car against damage The insurance charge I in dollars is given by the function I 5 70 0 15 M Let C be the total charge in dollars for a rental that includes insurance Write an equation relating C to M Simplify your answer as much as possible 0 C X