Free points = what is 1+1

What is this inequality notation? t is less then or equal to 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?

How can you construct perpendicular lines and prove theorems about perpendicular lines