10:14 PM Fri Jan 28 4. Residents of the town of Maple Grove who are connected to the municipal water supply are billed a xed amount monthly plus a charge for each cubic foot of water used. A household using 1000 cubic feet was billed $40, while one using 1600 cubic feet was billed $55. (a) (3 points) What is the charge per cubic foot? (b) (3 points) Write an equation for the total cost of a resident's water as a function of cubic feet of water used. (c) (3 points) How many cubic feet of water used would lead to a bill of $100? 5. (6 points) Given the function f (w) = 1 Find and simplify the following expressions. m + h) me) (a) f x a 6. (3 points) Let f and g be linear functions with equations f(ac) = mm + b1 and g(:c) = mga: + ()2. Is f o g also a linear function? If so, what is the slope of its graph? As usual, provide a complete explanation