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
$19.95
10
$20.45
20
$20.95
30
$21.45
40
$21.95

Answer 1

@peachpi

Answer 2

@welshfella

Answer 3

I don't understand the question to be honest. Is it average rate of change or charge?

Answer 4

The average rate of change is $0.50, meaning that for each minute of talk time, the monthly bill increases by $0.50.
The average rate of change is $0.50, meaning that for every ten minutes of talk time, the bill increases by $0.50.
The average rate of change is $0.05, meaning that for each minute of talk time, the monthly bill increases by $0.05.
The average rate of change is $0.05, meaning that for every ten minutes of talk time, the bill increases by $0.05.

Answer 5

@welshfella

Answer 6

ok look at the last 2 costs 21.95 and 21.45
difference = $0.50
and difference in time is 10 minutes
so?

Answer 7

B

Answer 8

yes

Answer 9

ok thanks

Answer 10

yw

Answer 11

Hold on - I'm not sure here. C could also be right as that is the rate per minute

Answer 12

sorry guy i'm not sure about this one . the average is usually the rate per unit of time which is a minute in this case.

I would go for C but i'm not absolutely sure.