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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 The average rate of change is $1.30, meaning that for each minute of talk time, the monthly bill increases by $1.30. The average rate of change is $0.07, meaning that for each minute of talk time, the monthly bill increases by $0.07. The average rate of change is $1.30, meaning that for every ten minutes of talk time, the monthly bill increases by $1.30. The average rate of change is $0.07, meaning that for every ten minutes of talk time, the monthly bill increases by $0.07.

Respuesta :

SofiaFED
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. "

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