59% of 127 i need the steps btw i am in middle school

I'm terrible at math any here is appreciated.

Evaluate the following expression 1/3^2

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?