Residents of a town of maplegrove who are connected to the municipal water supply are billed a fixed amount plus a monthly chare for each cubic foot of water used. A household usin 1000 cubic feet was billed $40 while a house using 1600 cubic feet was billed $55.
a) what is the charge per cubic foot?
b) Write an equation for the total cost of a residents water as a function of cubic feet and water used.
c).How many feet of cubic water would lead to a bill of $100.