Question

The table shows the relationship between the cost of monthly cell phone Plan A and the number of minutes used within a month. The 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?



$

Answer 1

$50

Explanation:

Answer 2

It should be $50.00.

Explanation:

It shows that every 2 mins. adds 20 cents to the bill. I wrote out the numbers and did this:

6 30.60

8 30.80

10 40.00

12 40.20

14 40.40

16 40.60

18 40.80

20 50.00