# 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...

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

llltkl | Student

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.