A car rental company's standard charge S includes an initial fee plus an additional fee for each kilometer driven. The standard charge (in dollars) is given by the function S=17.75+0.60k, where k is the number of kilometers 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+0.25k.
Let c be the total charge (in dollars) for a rental that includes insurance. Write an equation relating c to k. Simplify your answer as much as possible.
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