Question

The graph below shows the distance (y) in kilometers of two cars from their destination at different times (x) in minutes. The table shows the values plotted on the graph.

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

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

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?

Answer 1

@wolfe8

Answer 2

May I please have some help @wolfe8

Answer 3

Domain is what you use for x. For rate of change, use difference in y divided by difference in x.

Answer 4

For C. I got The domain for the functions of Car 1 and Car 2 is 0.
For D. I got -0.55477

Answer 5

Are they both incorrect?

Answer 6

@wolfe8 I don't know if they're both wrong or not. If they are, could you please explain? :/

Answer 7

The first is wrong. Domain is all the possible values for x of a function f(x)=y

Answer 8

For second, use the formula (y2-y1)/(x2-x1)

Answer 9

So, the first one is wrong, and the second one is correct?

Answer 10

@wolfe8

Answer 11

@tester97 @zzr0ck3r @hba @

Answer 12

@e.mccormick @e.mccormick

Answer 13

Second one is incorrect too

Answer 14

...but...I did the (y2-y1)/(x2-x1). Could you please help me solve it? I am really having a hard time.

Answer 15

Show me what you did.

Answer 16

Ok hold on.

Answer 17

22.285 - 33.3804 -11.0954
__________________ = ____________ = -0.55477

40 - 20 20

Answer 18

The question asks between 20 and 40. You used 30 and 40

Answer 19

For the y value

Answer 20

No I didn't.

Answer 21

Could you show me how you did it?

Answer 22

Please?

Answer 23

hello

Answer 24

@wolfe8 I am confused.

Answer 25

hello

Answer 26

@timo86m @Preetha @nubeer @tester97 @Mrbonez321