The monthly cost (in dollars) of water use is a linear function of the amount of water used (in cubic meters, m3). The cost for using 32 m3 of water is $43.31, and the cost for using 45 m3 is $60.86. What is the cost of using 44 m3 of water?

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge