Question

Help please!

Answer 1

The graph shows the temperature over a period of time of a chemical compound that is placed in a cold chamber. What is the domain of this function?

Graph showing a line segment that goes from ordered pairs 0, 20 to 35, negative 10

The domain is all real numbers 20 through negative 10.

The domain is all integers from 20 through negative 10.

The domain is all real numbers 0 through 35.

The domain is all integers from 0 through 35.

Answer 2

I think it is the first one.

Answer 3

Domain is all possible values of the "input" x. Here "minutes" is the input and serves as the possible values of x.

So what are all possible values of x in the graph?

Answer 4

0, 5, 10, 15, 20 and 25?

Answer 5

Can x be 30?

Answer 6

Can't x be 35? If x = 35, y = -10...agree?

Answer 7

c is the ans

Answer 8

One second...can x be 22?

Answer 9

yeah x can

Answer 10

Gorv...I know that you know the answer; I wantundeadnight26 to clearly see the answer.

Answer 11

x can be any number bet ween 0 to 35

Answer 12

Its c because it can be all real numbers from 0 - 35..oh i understand now!

Answer 13

OK. Great!

Answer 14

thanks easy and gorv!

Answer 15

sorry buddy but please mention the name ..i thought u asked me sory sorry

Answer 16

@Easyaspi314

Answer 17

gorv...how do you type the name to draw your attention?

Answer 18

I have one more question...can i post it here?

Answer 19

yes

Answer 20

put at sign...

Answer 21

then name.

Answer 22

is there an easier way?

Answer 23

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,$17.45
40,$18.95
The average rate of change is $1.00, meaning that for every ten minutes of talk time, the monthly bill increases by $1.00.

The average rate of change is $1.00, meaning that for each minute of talk time, the monthly bill increases by $0.10.

The average rate of change is $0.10, meaning that for every ten minutes of talk time, the bill increases by $0.10.

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

Answer 24

@ put this symbol

Answer 25

like @name

Answer 26

thats what i meant :D

Answer 27

undeadnight26....average rate of change is the slope. Compute the slope by taking any two points.

Answer 28

name is an actual person???

Answer 29

any 2 points meaning 10 and 30?

Answer 30

@ after this undeadknight26

Answer 31

like @gorv

Answer 32

Take any two pints:
(0, 14.95) and (10, 15.95) Take the slope between these 2 points.

Answer 33

yea i no how to do it :D...

Answer 34

So do it..whats your answer?

Answer 35

no i was responding to gorv...

Answer 36

but i was thinking it was the last one...

Answer 37

Why the last one? Whats your work?

Answer 38

the average change between them are .50 and 1.00...

Answer 39

mostly 1.00 every ten minutes though.

Answer 40

What is the slope between the 2 points?

Answer 41

its a positive slope, right?

Answer 42

Wait i don't understand from 30 minutes to 40 minutes there was a 1.50 change???

Answer 43

yes...the question wants the average rate of change for the 40 minutes...so we need to take the slope between the two points
(0, 14.95) and (40, 18.95).

Answer 44

slope = difference in y-values/difference in x-values

In this case, the difference in y-values is $18.95 - $14.95 = $4.00

Answer 45

The difference in x-values is 40-0= 40

So the slope is 4/40 = 1/10

Now what does the 1/10 represent?

Answer 46

Ummm...0, 14.95?

Answer 47

Undeadnight26....you dont want to take the slope between 30 minutes and 40 minutes...the question says to find the average rate of change for the 40 minutes...means from time 0 till time 40, just like what I did above.

Answer 48

Understand what we want to do?

Answer 49

but what does 1/10 represent?

Answer 50

not really...

Answer 51

Thats the question..what does the 1/10 mean? Once we understand what that 1/10 means, we will have the correct choice.

Answer 52

Since slope = change in y divided by change in x; in this problem y is the dollar amount or cost, and x is the time in minutes

Therefore 1/10 is 1 dollar for every 10 minutes

Answer 53

ohhh...

Answer 54

1/10...the 1 in the numerator represents the y; the 10 in the denominator represents the x; so 1/10 is the change in cost per minute

Answer 55

So which is the correct choice?

Answer 56

the first one?

Answer 57

since its $1 every minute?

Answer 58

But the rate of change is not $1.00

Answer 59

The average rate of change is 1/10 or 10 cents or $.10

Answer 60

So it has to be between choice C or D. Read the choices carefully.

Answer 61

so is it .10 every minute?

Answer 62

agree

Answer 63

so is it...the last one?

Answer 64

yes

Answer 65

yay thank you!!!

Answer 66

10/10 yay!!!

Answer 67

this question wasnt just asking you to compute slope (average rate of change), but was testing your understanding what slope represents.

Answer 68

lol this means i have to study slope again right?

Answer 69

Yes. Do you have another word problem like this one? You can put up another one, and we can see if you understand how to do it.

Answer 70

?

Answer 71

no that was it think you.

Answer 72

ok. welcome.