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Megan's text message plan charges $0.20 for each message over 450 in addition to a $7 base charge. If she owes $34.20 for text messaging in the month of July how many text messages did she send that month?

Respuesta :

rashmikushwahask

Step-by-step explanation:

Let number of text messages sent be m, and amount owed, O

Then, O(m) = .25(m - 350) + 14, with m+%3E=+350

72.5 = .25m - 87.5 + 14 ------- Substituting 72.5 for O(m)

72.5 = .25m - 73.5

72.5 + 73.5 = .25m

146 = .25m

m, or number of messages sent that month = highlight_green%28matrix%281%2C3%2C+146%2F.25%2C+%22=%22%2C+584%29%29

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