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 $19.95
10 $20.45
20 $20.95
30 $21.45
40 $21.95
A.) The average rate of change is $0.50, meaning that for each minute of talk time, the monthly bill increases by $0.50.
B.) The average rate of change is $0.50, meaning that for every ten minutes of talk time, the bill increases by $0.50.
C.) The average rate of change is $0.05, meaning that for each minute of talk time, the monthly bill increases by $0.05.
D.) The average rate of change is $0.05, meaning that for every ten minutes of talk time, the bill increases by $0.05.
2 answers:
For this case, the first thing we must do is find the average rate of change for the mentioned interval.
By definition we have to:
Substituting values we have:
Rewriting we have:
Answer:
C.) The average rate of change is $0.05, meaning that for each minute of talk time, the monthly bill increases by $0.05.
The answer would be B <span>The average rate of change is $0.50, meaning that for every ten minutes of talk time, the bill increases by $0.50. </span>
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Step-by-step explanation: