Question

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 $14.95
10 $15.95
20 $16.95
30 $17.95
40 $18.95

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.

Answer 1

Monthly cost of cell phone for 0 minutes is $19.95 and for 40 minutes of talk is $21.95. 

It means that average rate of change ( increase of monthly cost for each minute of talk time ) is: ARC = ( 21.95 - 19.95 ) / ( 40 - 0 ) = 2.00 / 40 = $0.05. 

Answer: D.)The average rate of change is $0.10, meaning that for each minute of talk time, the monthly bill increases by $0.10. 

Answer 2

The answer would be A. Need an explanation or u good?