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a family pays $117.50 in December for 11 therms of gas to heat their home ( a therm is a unit of gas) and $172.50 for 150 therms in January.

a family pays $117.50 in December for 11 therms of gas to heat their home ( a therm is a unit of gas) and $172.50 for 150 therms in January. Assuming that the cost of gas depends linearly on the quantity used, find : a formula for cost, C, in dollars, in terms of g, the number of therms used.

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