Virgin Mobile offers a cell phone plan that charges 20 dollarsper month for up to 400 minutes
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Question:
Virgin Mobile offers a cell phone plan that charges 20 dollarsper month for up to 400 minutes of use, plus 15 cents for each textmessage. Assuming that a user does not exceed the monthly 400minutes of phone time, find a function that describes the totalcost of using the phone for one month as a function of the numberof text messages, t .
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