Cost of Natural Gas In May 2006, Nicor Gas had the
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Cost of Natural Gas In May 2006, Nicor Gas had the following rate schedule for natural gas usage in single-family residences: Monthly customer charge Distribution charge 1st 20 therms Next 30 therms Over 50 therms Gas supply charge $8.85 $0.1557/therm $0.0663/therm $0.0519/therm $0.66/therm (a) What is the charge for using 40 therms in a month? (b) What is the charge for using 202 therms in a month? (c) Construct a function that gives the monthly charge C for x therms of gas. (d) Graph this function. Source: Nicor Gas, Aurora, Illinois, 2006
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