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 1100 cubic feet was billed $130, while one using 1800 cubic feet was billed $165. (a) What is the charge per cubic foot? dollars per cubic foot (b) Write an equation for the total cost, 6, of a resident's water, 21), as a function of cubic feet of water used. cw (c) How many cubic feet of water used would lead to a bill of $190? The volume of water in a pond over a period of 20 weeks is shown in the figure below. volume of water (cubic meters) 1600 1200 800 400 5 10 15 20 t (weeks) (c) Estimate the average rate of change between t = 0 and t = 10. Interpret your answer in terms of water. Enter the rate as a positive value, rounded to the nearest integer. For the first 10 weeks, the volume of water is growing at an average rate of about weeks