Discover the best answers to your questions with the help of IDNLearn.com. Our experts provide accurate and detailed responses to help you navigate any topic or issue with confidence.

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 gives a line with a slope of 1.55. See the figure below. If the monthly cost for 17 HCF is $47.51, what is the monthly cost for 21 HCF?