MeowLover17
  • MeowLover17
Part A: What does the x-intercept of the function for car 1 represent? (2 points) Part B: What does the y-intercept of the function for car 2 represent? (2 points) 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 = 30 for the function representing the motion for car 2? What does the value of this average rate of change represent? (4 points)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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MeowLover17
  • MeowLover17
@HelpBlahBlahBlah
MeowLover17
  • MeowLover17
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welshfella
  • welshfella
A x-intercept is the time 60 minutes he has taken to travel to his destination.

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welshfella
  • welshfella
B This represents the distance (60 km) away form the cars destination
welshfella
  • welshfella
C The domain is the values of the times ( what do you think the values are?)
welshfella
  • welshfella
D:- Hint at time = 20 car 2 is 40 miles for its destination at time = 30 it is 34 miles form its destination
MeowLover17
  • MeowLover17
@welshfella
MeowLover17
  • MeowLover17
@welshfella I dont understand C nor D. could you please explain more?
MeowLover17
  • MeowLover17
hi welsh
MeowLover17
  • MeowLover17
So about c i dont understand what domain (x) values they want
welshfella
  • welshfella
The domain is the possible values of the horizontal (time) axis. From the diagram what do you think they are? Note that you have to consider both Car A and Car B together.
MeowLover17
  • MeowLover17
[0,positive infinitey)
MeowLover17
  • MeowLover17
?
welshfella
  • welshfella
oopps sorry I think they want a domain for Car A and another for Car B.
MeowLover17
  • MeowLover17
Oh okay
welshfella
  • welshfella
Thats the correct domain for car B what about Car A?
MeowLover17
  • MeowLover17
could you give me the domain for car b and i figure it out for car a?
MeowLover17
  • MeowLover17
I got it so for A the domain would be [0,60)
MeowLover17
  • MeowLover17
Right?
welshfella
  • welshfella
[0 , +INF) is domain for car B
welshfella
  • welshfella
yes thats right for A
MeowLover17
  • MeowLover17
Yes as i said earlier so the domain for car A is [0,60)
welshfella
  • welshfella
no 60 is INCLUDED in the Domain so it is [0,60]
welshfella
  • welshfella
square bracket after the 60
MeowLover17
  • MeowLover17
okay cool so for part C Part C: The domain for Car A would be [0,60) and for Car B the domain is [0,+INF)
MeowLover17
  • MeowLover17
Oh sorry i mean [0,60]
welshfella
  • welshfella
yes thats right
MeowLover17
  • MeowLover17
And you provided me with the answers for a and b right?
welshfella
  • welshfella
yes
MeowLover17
  • MeowLover17
So all i need is D please explain it cause i dont understand it what so ever
welshfella
  • welshfella
the average rate of change = average speed of Car 2 during the period 20 to 30 minutes
MeowLover17
  • MeowLover17
Okay
welshfella
  • welshfella
and this is (40-34) / (30-20) kms / minute
MeowLover17
  • MeowLover17
@welshfella Could you provide me with the answer im hopeless
welshfella
  • welshfella
what is 40 - 34 ? and 30 - 20 ? i'm sure you can do that
MeowLover17
  • MeowLover17
40-34= 6 and 30-20 = 10
MeowLover17
  • MeowLover17
what do i do with theese numbers?
welshfella
  • welshfella
right so speed = 6 / 10 = 0.6 kms/minute
MeowLover17
  • MeowLover17
Okay
MeowLover17
  • MeowLover17
sorry i didnt provide you with this char Time (in minutes) x 0 10 20 30 40 50 60 Car 1 (in km) y 60 50 40 30 20 10 0 Car 2 (in km) y 60 49.02438 40.05648 32.72904 26.742 21.8502 17.85318
MeowLover17
  • MeowLover17
Time (in minutes) x 0 10 20 30 40 50 60 Car 1 (in km) y 60 50 40 30 20 10 0 Car 2 (in km) y 60 49.02438 40.05648 32.72904 26.742 21.8502 17.85318
welshfella
  • welshfella
this value represents the car's average speed between times 20 and 30 minutes
MeowLover17
  • MeowLover17
I hope this chart does not change our answers
MeowLover17
  • MeowLover17
So my answer for Part D would be Part D: The average rate of change is speed = 6 / 10 = 0.6 kms/minute, and this represents the car's average speed between times 20 and 30 minutes
MeowLover17
  • MeowLover17
@welshfella Is that right
MeowLover17
  • MeowLover17
?
welshfella
  • welshfella
the speed of car B will be different as i just read the values off the graph
MeowLover17
  • MeowLover17
Oh okay so my second part of the answer is right but now i need to figure out the speed using the chart?
welshfella
  • welshfella
speed = (40.05648 - 32.72904) / 10
MeowLover17
  • MeowLover17
ok so its .732744
MeowLover17
  • MeowLover17
So .732744 my average rate of change??
welshfella
  • welshfella
kms / minute Yes
welshfella
  • welshfella
yes
MeowLover17
  • MeowLover17
Okay so my Anser for part D is
MeowLover17
  • MeowLover17
The average rate of change is 0.732744 kms/minutes and this represents the car's average speed between times 20 and 30 minutes.
MeowLover17
  • MeowLover17
Is that correct?
welshfella
  • welshfella
yes
MeowLover17
  • MeowLover17
Thanks for your help

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