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A mobile plan charges a base monthly rate of $10 for the first 500 minutes of air time plus a charge of 15 for each additional minute.

A mobile plan charges a base monthly rate of $10 for the first 500 minutes of air time plus a charge of 15¢ for each additional minute. Write a piecewise-defined linear function which calculates the monthly cost C (in dollars) for using "m" minutes in the air.

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