Acell 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.