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For her phone service, Martina pays a monthly fee of

$28

, and she pays an additional

$0.06

per minute of use. The least she has been charged in a month is

$88.72

.

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

.

Verified Answer :

If you make an equation first, 88.72 ≤28+.06m, you can figure it out.
First you subtract 28 from 88.72 getting 60.72≤.06m. Then you divide both sides by .06. Then you get your final answer, which is an inequality, 1012≤m.
That means that Martina uses at least  1012 minutes of service.

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