12. You are going to choose from two long distance plans.
Plan A: Monthly fee of $25 and a cost of $0.05 per minute for long distance calls.
Plan B: Monthly fee of $10 with a cost of $0.10 per minute for long distance calls.
Let x represent the number of long distance minutes.
a. Write an expression for the cost of x minutes for Plan A.
b. Write an expression for the cost of x minutes for Plan B.
c. If you talked 200 minutes in January, which plan would be better?
d. For how many minutes will the cost for the two plans be the same?