The cost of cellular service is proportional to the number of minutes provided per month. it does not cost anything when no minutes are used. what does the ordered pair (400, 120) represent in the context of the situation? a. it represents the cost of the plan if 400 minutes are used. b. it represents the cost of the plan if 120 minutes are used. c. it represents the number of minutes used in a month. d. it does not represent anything since the point is not on the line.