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For her phone service, Martina pays a monthly fee of$27 , and she pays an additional...

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saraward070911 | eNotes Newbie

Posted November 22, 2013 at 11:04 AM via web

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For her phone service, Martina pays a monthly fee of$27 , and she pays an additional $0.05 per minute of use. The least she has been charged in a month is $79.70. What are the possible numbers of minutes she has used her phone in a month? Use for the number of minutes, and solve your inequality for m

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llltkl | College Teacher | (Level 3) Valedictorian

Posted November 22, 2013 at 12:02 PM (Answer #1)

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Martina pays a monthly fee of $27 , and she pays an additional $0.05 per minute of use.

Using m as the number of minutes used, the total bill she will pay=27+0.05m

The least she has been charged in a month is $79.70. So, the equation for the linear inequality is:

 27+0 .05m `>=` 79.70

`rArr` 0.05m `>=` 79.70-27

`rArr` 0.05m `>=` 52.70

`rArr` m `>=` `52.70/0.05`

`rArr` m `>=` 1054

Therefore, the possible numbers of minutes she has used her phone in a month is 1054.

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