Cost of Natural Gas In April 2009, Nicor Gas had the
Chapter 3, Problem 50(choose chapter or problem)
Cost of Natural Gas In April 2009, Nicor Gas had the following rate schedule for natural gas usage in singlefamily residences: Monthly customer charge $8.40 Distribution charge 1st 20 therms $0.1473/therm Next 30 therms $0.0579/therm Over 50 therms $0.0519/therm Gas supply charge $0.43/therm (a) What is the charge for using 40 therms in a month? (b) What is the charge for using 150 therms in a month? (c) Develop a model that gives the monthly charge C for x therms of gas. (d) Graph the function found in part (c). Source: Nicor Gas,Aurora, Illinois, 2009
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