Question

Please Help! Algebra is so hard!!!

Part C: What is the domain of the functions for car 1 and car 2? (2 points)

Part D: What is the average rate of change from x = 20 to x = 40 for the function representing the motion for car 2? What does the value of this average rate of change represent? (4 points)

Time
(in minutes)
x 0 10 20 30 40 50
Car 1
(in km)
y 50 40 30 20 10 0
Car 2
(in km)
y 50 40.85365 33.3804 27.2742 22.285 18.2085

Answer 1

@Hero Will you please help me? I am so confused!!!

Answer 2

I know the domain of the first car but I am confused about the domain of the second one and I forget how to find average rate of change.

Answer 3

What is the domain of the first car?

Answer 4

0 <_ x <_ 50

Answer 5

And the domain of the second car?

Answer 6

I don't know the domain of the second car. I am confused about how to find it since it is decreasing exponentially and doesn't have a stopping time on the graph or the table.

Answer 7

looks like the graph cuts off at t = 90

Answer 8

Well it looks like it but I don't know if I can be sure about that. It needs to be the definite domain.

Answer 9

Can you explain how I can find it?

Answer 10

To know for 100% certainty, you'd need the actual equation for car two.

Answer 11

How?!?!?

Answer 12

I've been trying to do that this whole time but I don't know how :(

Answer 13

Do they give you answer choices for part C?

Answer 14

No it is supposed to be a written answer.

Answer 15

@Hero ????

Answer 16

In this case, common sense applies. Go with what makes the most sense.

Answer 17

*Sigh* nevermind I will try to figure it out or get my brother to help me.

Answer 18

Good luck