In October 2021, Spire, Inc. had the following rate schedule for natural gas usage in single-family residences.

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In October 2021, Spire, Inc. had the following rate schedule for natural gas usage in single-family residences.image


(a) What is the charge for using 20 therms in a month?(b) What is the charge for using 100 therms in a month?(c) Develop a function that models the monthly charge C for x therms of gas.(d) Graph the function found in part (c).

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