Question

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
.

Answer 1

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.