PLZ HELP ME WILL GIVE BRAINLIEST

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?

What is the distance between point a and b

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?