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?
a. the average rate of change is $1.00, meaning that for every ten minutes of talk time, the monthly bill increases by $1.00.
b. the average rate of change is $1.00, meaning that for each minute of talk time, the monthly bill increases by $0.10.
c. the average rate of change is $0.10, meaning that for every ten minutes of talk time, the bill increases by $0.10.
d. the average rate of change is $0.10, meaning that for each minute of talk time, the monthly bill increases by $0.10.