A cell phone plan costs $30.70 per month for 400 minutes of talk time. It costs an additional $0.06 per minute for each minute over 400 minutes. To get e-mail access, it costs %30 of the price for 400 minutes of talk time. Your bill, which includes e-mail, is the same each month for 9 months. The total cost for all 9 months is $402.39. Write and solve an equation to find the number of minutes of talk time you use each month. Let m represent the number of minutes over minutes each month. Which equation represents the given situation?
