What is deviation from mean

Answer this question! 30 points and brainliest! only if you know the answer.

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?

Do,h = (7, 9) (14, 18) the scale factor is