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20 February, 18:46

A telephone company offers two plans with per-minute charges. Plan A involves a monthly rental of $12, and call charges at 7¢ per minute. Plan B involves a monthly rental of $15, and call charges at 5¢ per minute.

Write an inequality in terms of the number of minutes which shows when Plan A is less expensive than Plan B. Solve the inequality, showing the steps in your work.

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  1. 20 February, 19:03
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    7m+12<5m+15

    7m-5m+12<5m-5m+15

    2m+12<15

    2m+12-12<15-12

    2m<3

    2m/2<3/2

    m<3/2
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