Higher Order Thinking A cell phone plan is shown at the right. The rates, which include an unlimited data plan, are the same each month for 7 months. The total cost for all 7 months is $180.39. Let m represent the average number of minutes that exceeds 700 minutes each month. a. Write an equation to represent the given situation. b. Solve the equation to determine how many additional minutes, on average, you use each month.