12 is what percent of 14?

Which statement about the graph of y = 8(0.25)^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?

What is the result of adding the system of equations? 2x+y=4 3x-y=6