A phone company offers two monthly charge plans. In Plan A, the customer pays a monthly fee of

$13
and then an additional
6
cents per minute of use. In Plan B, there is no monthly fee, but the customer pays
8
cents per minute of use.
For what amounts of monthly phone use will Plan A cost at least as much as Plan B?
Use
m
for the number of minutes of phone use in a month, and solve your inequality for
m
.

5 answers

For m minutes, we want A >= B. So

13+0.06m >= 0+0.08m
A phone company offers two monthly charge plans. In Plan A, the customer pays a monthly fee of
$5
and then an additional
4
cents per minute of use. In Plan B, there is no monthly fee, but the customer pays
6
cents per minute of use.
For what amounts of monthly phone use will Plan A cost at least as much as Plan B?
Use
m
for the number of minutes of phone use in a month, and solve your inequality for
m
.
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A phone company charges 15 cents a minute to call a person long distance and a flat charge of 50 cents. If you want to spend no more than $5.00 on a phone call, write an inequality to represent this situation. *