Residents of the town of Maple Grove who are connected to the municipal water supply are billed a fixed amount monthly plus a charge for each cubic foot of water used. A household using 1300 cubic feet was billed $109, while one using 1700 cubic feet was billed $121. (a) What is the charge per cubic foot? dollars per cubic foot (b) Write an equation for the total cost, c, of a resident's water, w, as a function of cubic feet of water used. dollars C = (c) How many cubic feet of water used would lead to a bill of $130? cubic feet