Question

Suppose that a household's 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

If the monthly cost for 23 HCF is
$48.31 , what is the monthly cost for
18 HCF?

Answer 1

Find the unit price=48.32/23=$2.10

Then you multiply it by 18=37.815=37.82