How can you find the area of a square that has another square in it subtract the inner square

He concluded that a heavier object dropped from the same height as a lighter object will land

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?

Wrote and expression for the difference of p and 4