Tell whether the rates of change are constant or variable 16 over 1, 64 over 2, 144 over 3, 256 over 4

Step-by-step explanation:

Let m denotes the number of minutes of phone use in a month.

In plan a there is no monthly fee, but the customer pays 8 cents per minute of use.

Total cost of plan a =

In Plan B the customer pays a monthly fee of $2.40 and then an additional 7 cents per minute of use.

Total cost of plan b =

To find amount of monthly phone use for which plan a cost more than plan b, solve the inequality .