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For her phone service, Donna pays a monthly fee of $20, and she pays an...

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Basic Math

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For her phone service, Donna pays a monthly fee of $20, and she pays an additional $0.07 per minute of use. The least she has been charged in a month is $100.78. What are the possible numbers of minutes she has used her phone in a month? Use m for the number of minutes, and solve your inequality for m.

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