...are billed a fixed amount yearly plus a charge for each cubic foot of water used. A household using 1000 cubic feet was billed $84, while one using 1600 cubic feet was billed $126.
I need to know:
a) What is the exact charge per cubic foot?
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.
c) How many cubic feet of water used would lead to a bill of $165? Give your answer to the nearest cubic foot.
Thank you so much! I've got my final tomorrow and I could really use some help with these kinds of problem