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? (1 point) Total minutes of talk time Monthly cost of cell phone 0 $14.95 10 $15.95 20 $16.95 30 $17.95 40 $18.95
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Monthly cost of cell phone for 0 minutes is $19.95 and for 40 minutes of talk is $21.95.
Now we ca find the average rate of change by using the formula.
Increase of monthly cost for each minute of talk time
ARC = ( 21.95 - 19.95 ) / ( 40 - 0 ) = 2.00 / 40 = $0.05.
The average rate of change is $0.10, meaning that for each minute of talk time, the monthly bill increases by $0.10.
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