Residents of the town of Maple Grove who are connected to the municipal water supply are billed a fixed amount yearly plus a charge for each cubic foot of water used. A household using 1000 cubic feet was billed $56, while one using 1600 cubic feet was billed $84. (a) What is the charge in dollars per cubic foot? Give an exact answer. 28 600 (b) Write an exact equation for C, the total cost, of a resident's water as a function of w, cubic feet of water used. Use lower case w. (10 + 1) + ( C(W) = 28 600 x (c) How many cubic feet of water used would lead to a bill of $130? Round your answer to the nearest cubic foot. 43

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