Is the answer I chose correct? Thank you for answering if you did :)

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Can someone me and plz do the problem

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?