Question

A science experiment begins with a metal at -100° Celsius. The following function describes the temperature change per minute: f(x) = 89x - 100°. How will the graph of this function change if the metal is at 25° at the start of the experiment?

The line will shift vertically up by 125°.

The line will shift vertically up by 25°.

The line will shift vertically down by 125°.

The line will shift vertically down by 25°.

Answer 1

@Andras

Answer 2

Instead of f(x)=89x-100
it will be
f(x)=89x+25
That is equivalent of shifting the line vertically up by 125. (-100 to 0 is 100 and 0 to 25 is an extra 25, thus 125)

Answer 3

How come it changes to a plus? @Andras

Answer 4

As that was stated.
at 25° means +25°

Answer 5

Oops sorry I didn't see that :( I have two more and they're pretty tough. Up for the challenge I'll give medals?

Answer 6

As you wish I am getting tired of maths a bit. Been on this site today for too long

Answer 7

Ok here goes.

Answer 8

Given f(x) and g(x) = f(x) + k, look at the graph below and determine the value of k.

k = ______

Answer 9

@Andras

Answer 10

5

Answer 11

The answer is 5?

Answer 12

Yes, I am getting lazy :)
Do you see why?

Answer 13

Not really :(

Answer 14

What is common in the 2 lines?

Answer 15

they're parallel

Answer 16

Yep.
Let us say that the first lines equation is as follows
y=mx+a

Answer 17

Than what do we know of other parallel lines with this?

Answer 18

Slope is the same

Answer 19

y=mx+a
which of these represents the slope?

Answer 20

The blue??

Answer 21

from the above equation

Answer 22

I'm getting lazy oops

Answer 23

Ok I have one last question for @Andras

Answer 24

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
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 25

Anyway what I wanted you to say is m.
And the line was shifted vertically up by 5 thus the answer is 5

Answer 26

Ohhhh, wow. Sorry I didn't readv through.

Answer 27

Am I right that the question states that for nearly 20 bucks you get 0 minutes. ROBBERY

Answer 28

Yes you are.

Answer 29

Average!
So we only need to check the end points.
for 0 min: $19.95
for 40 min: $21.95

Also we are asked for the rate of CHANGE
the change is 21.95-19.95=2 but that is for 40 min

For 1 min it is 2/40=0.05

Answer 30

So its C or D?

Answer 31

OR for every 10 minutes the change is 10*0.05=0.5

Answer 32

What do you think

Answer 33

D?

Answer 34

FAIL

Answer 35

Aw then C

Answer 36

B or C.
I think they are looking for B as all the changes were given in 10 minutes periods

Answer 37

Thanks

Answer 38

Yes I am sure that it is B.
As the plan does not change for every single minute

Answer 39

Alright man! I'm done.