Question

A cell phone plan has a monthly cost that is shown in the table below. What is the correct statement regarding the average rate of change during the 40 minute time of talk?
Total minutes of talk time:
0
10
20
30
40
Monthly cost of cell phone
9.95
10.65
11.35
12.05
12.75

Answer 1

Based on the given table, the correct statement regarding the average rate of change during the 40 minutes time of talk is that for every 10 minutes, an additional 0.7 is added. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help. 

Answer 2

The correct answer is B. This means that for each minute of talk time the monthly bill increases by $0.07.

Average rate of change from t=0 to t=40 can be calculated as:

$12.75-$9.95/40-0=0.07