Question

Help Please!!! 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?

Answer 1

Total minutes of talk time:
0
10
20
30
40
Monthly cost of cell phone
9.95
10.65
11.35
12.05
12.75

Answer 2

@cuitiefromthesouth2 Can you help explain to me how to solve this?

Answer 3

i really don't know, i am sorry, is there anymore info on what to do?

Answer 4

Nope, that's the entire question :/ Would you happen to know anybody who might be able to help me on this?

Answer 5

@bibby @shamil98 Could you guys help me??

Answer 6

rate of change. nin's specialty.

Answer 7

Does that have to do with the fact that the price goes up by 70 cents every 10 minutes?

Answer 8

I think you just have to write it in the form \(y = mx + b\). Then your rate of change is the slope, with is \(m\).

(You can confirm this by taking the derivative, but that's overkill)

Answer 9

I have no idea :/ I am really far behind and I missed this lesson... Thats why I am asking for help. I don't know what the first step to solving this

Answer 10

Here are all of the possible answers:
The average rate of change is $1.30, meaning that for each minute of talk time, the monthly bill increases by $1.30.
The average rate of change is $0.07, meaning that for each minute of talk time, the monthly bill increases by $0.07.
The average rate of change is $1.30, meaning that for every ten minutes of talk time, the monthly bill increases by $1.30.
The average rate of change is $0.07, meaning that for every ten minutes of talk time, the monthly bill increases by $0.07.

Answer 11

Ok, pick two points and find the slope between them.
\[m = \frac{12.75 - 12.05}{40 - 30}\]

Answer 12

So its \[M=\frac{ 0.7 }{ 10 }\]

Answer 13

Yes. So simplify that, and that's your rate of change per minute.

Answer 14

So the rate of change per minute is 0.7?

Answer 15

No. Simplify 0.7/10

Answer 16

its 0.07 right?

Answer 17

Yes.

Answer 18

Thanks