Aset of dishes cost 46$ and is on sale at a saving of 30%. how much will i save on the set of dishes?

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?

Ihonestly have no clue if it's each or none.

Which of the following graphs could represent a cubic function?