Acar 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+15.750.50m , 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+3.700.25m . 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.