A building casts a 72-foot shadow on the ground when the angle of elevation of the sun is 40°. How tall is the building, to the nearest foot?

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?