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The function y=5.45+1.05(x+7) can be used to determine the cost in dollars for a prepaid cell phone plan of x minutes. What is the rate

The function y=5.45+1.05(x+7) can be used to determine the cost in dollars for a prepaid cell phone plan of x minutes. What is the rate of change for the cost, in dollars, with respect to the number of minutes purchased?

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