Aphone company offers two monthly charge plans. in plan a, there is no monthly fee, but the customer pays cents per minute of use. in plan b, the customer pays a monthly fee of and then an additional cents per minute of use. for what amounts of monthly phone use will plan a cost more than plan b? use for the number of minutes of phone use in a month, and solve your inequality for .

For more than 180 minutes of phone use.

Explanation:

Let m represent number of minutes of phone use in a month.

We have been given that in Plan A, there is no monthly fee, but the customer pays $0.06 per minute of use.

The cost of using m minutes in plan A would be .

We are also told that in Plan B, the customer pays a monthly fee of $4.80 and then an additional $0.03 per minute of use.

The cost of using m minutes in plan B would be .

To find the amounts of monthly phone when Plan A will cost more than Plan B, we will set cost of plane A greater than cost of plan B as:

Let us solve for m.

Therefore, Plan A will cost more than Plan B for more than 180 minutes of phone use.

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