A mobile plan charges a base monthly fee of $19.00 for the first 475 minutes of air time plus a charge of $0.45 for each additional minute. Write a piecewise-defined linear function that calculates the monthly cost (in dollars) for using m minutes of air time. if 0 ≤m≤ 475 C(m) = 19m X .45m +8811.25 x if m > 475

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