The cost, c, of a health club membership is related linearly to its length in months, m. If a 12-month membership costs $260 and an 18-month membership costs $380, which equation can be used to find the cost of a 30-month membership?
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Question

The cost, c, of a health club membership is related linearly to its length in months, m. If a 12-month membership costs $260 and an 18-month membership costs $380, which equation can be used to find the cost of a 30-month membership?
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anonymous · Answer

A. C-380=18-12/380-260(30-18)
B.C-18=380-260/18-12(380-30)
C. C-380=380-260/18-12(30-12)
D. C-18=380-260/18-12(30-12)

jim_thompson5910 · Answer

can you post a screenshot of the whole thing?