one x intercept for a parabola is at the point (1,0). use the factor method to find the other x intercept for the parabola defined by y=x^2-10x-11

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?