Haw many ways can 8 books be arranged on a shelf

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?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Given the graphed function below which of the following orders pairs are found on the inverse function