Ahang glider flew to an altitude of 10,000 feet. fifteen minutes later, it's altitude was 7,000 feet. what was the average change in elevation per minute?

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?