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31 December, 21:14

For her phone service, Yolanda pays a monthly fee of $29, and she pays an additional $0.04 per minute of use. The least she has been charged in a month is

$72.36.

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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  1. 31 December, 22:52
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    Let the number of minutes be m

    29 + 0.04m ≥ 72.36

    0.04m ≥ 72.36 - 29

    0.04m ≥ 43.36

    m ≥ 1084 minutes
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