What’s is twenty one minus eight

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 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?

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.