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 Monthly cost of cell phone
0 $9.95
10 $10.65
20 $11.35
30 $12.05
40 $12.75
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At first, let's calculate output ( the last amount was earned minus first 12.75-9.95=2.8 than input the last minutes minus first 40-0=40 now output divided by input 2.8 divide by 40. So average rate of change is 0.07 and increase by 0,7.
The answer: "The average rate of change is $0.07, meaning that for each minute of talk time, the monthly bill increases by $0.07. "
Hope this helps
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