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Mathematics 7 Online
OpenStudy (anonymous):

Cell Phone Company A has a total monthly cost (c) is $20 each month plus $0.10 for each minute (m). Cell Phone Company B has a total monthly cost (c) of $15 each month plus $0.15 for each minute (m). Write a system that models this situation.

OpenStudy (texaschic101):

c = 20 + .10m (for company A) c = 15 + .15m (for company B)

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