Question

Jane has a pre-paid cell phone with A Fee and Fee. She can't remember the exact costs, but her plan has a monthly fee and a charge for each minute of calling time. In June she used 450 minutes and the cost was $120.00. In July she used 570 minutes and the cost was $144.00.
Express the monthly cost C as a function of x, the number of minutes of calling time she used.

Answer 1

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