The table shows the relationship between the cost of monthly cell phone Plan A and the number of minutes used within a month. Th
e equation c= 35+0.05m describes the relationships for the cost c in dollars for minutes m used for Plan B. Time (min) Cost ($)
0 30.00
2 30.20
4 30.40
What is the difference, in dollars, of the total costs of the cell phone plans if a customer talks for 20 minutes?
