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MeowLover17

  • one year ago

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)

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  1. MeowLover17
    • one year ago
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    @HelpBlahBlahBlah

  2. MeowLover17
    • one year ago
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  3. welshfella
    • one year ago
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    A x-intercept is the time 60 minutes he has taken to travel to his destination.

  4. welshfella
    • one year ago
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    B This represents the distance (60 km) away form the cars destination

  5. welshfella
    • one year ago
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    C The domain is the values of the times ( what do you think the values are?)

  6. welshfella
    • one year ago
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    D:- Hint at time = 20 car 2 is 40 miles for its destination at time = 30 it is 34 miles form its destination

  7. MeowLover17
    • one year ago
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    @welshfella

  8. MeowLover17
    • one year ago
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    @welshfella I dont understand C nor D. could you please explain more?

  9. MeowLover17
    • one year ago
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    hi welsh

  10. MeowLover17
    • one year ago
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    So about c i dont understand what domain (x) values they want

  11. welshfella
    • one year ago
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    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.

  12. MeowLover17
    • one year ago
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    [0,positive infinitey)

  13. MeowLover17
    • one year ago
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    ?

  14. welshfella
    • one year ago
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    oopps sorry I think they want a domain for Car A and another for Car B.

  15. MeowLover17
    • one year ago
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    Oh okay

  16. welshfella
    • one year ago
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    Thats the correct domain for car B what about Car A?

  17. MeowLover17
    • one year ago
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    could you give me the domain for car b and i figure it out for car a?

  18. MeowLover17
    • one year ago
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    I got it so for A the domain would be [0,60)

  19. MeowLover17
    • one year ago
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    Right?

  20. welshfella
    • one year ago
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    [0 , +INF) is domain for car B

  21. welshfella
    • one year ago
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    yes thats right for A

  22. MeowLover17
    • one year ago
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    Yes as i said earlier so the domain for car A is [0,60)

  23. welshfella
    • one year ago
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    no 60 is INCLUDED in the Domain so it is [0,60]

  24. welshfella
    • one year ago
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    square bracket after the 60

  25. MeowLover17
    • one year ago
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    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)

  26. MeowLover17
    • one year ago
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    Oh sorry i mean [0,60]

  27. welshfella
    • one year ago
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    yes thats right

  28. MeowLover17
    • one year ago
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    And you provided me with the answers for a and b right?

  29. welshfella
    • one year ago
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    yes

  30. MeowLover17
    • one year ago
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    So all i need is D please explain it cause i dont understand it what so ever

  31. welshfella
    • one year ago
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    the average rate of change = average speed of Car 2 during the period 20 to 30 minutes

  32. MeowLover17
    • one year ago
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    Okay

  33. welshfella
    • one year ago
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    and this is (40-34) / (30-20) kms / minute

  34. MeowLover17
    • one year ago
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    @welshfella Could you provide me with the answer im hopeless

  35. welshfella
    • one year ago
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    what is 40 - 34 ? and 30 - 20 ? i'm sure you can do that

  36. MeowLover17
    • one year ago
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    40-34= 6 and 30-20 = 10

  37. MeowLover17
    • one year ago
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    what do i do with theese numbers?

  38. welshfella
    • one year ago
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    right so speed = 6 / 10 = 0.6 kms/minute

  39. MeowLover17
    • one year ago
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    Okay

  40. MeowLover17
    • one year ago
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    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

  41. MeowLover17
    • one year ago
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    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

  42. welshfella
    • one year ago
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    this value represents the car's average speed between times 20 and 30 minutes

  43. MeowLover17
    • one year ago
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    I hope this chart does not change our answers

  44. MeowLover17
    • one year ago
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    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

  45. MeowLover17
    • one year ago
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    @welshfella Is that right

  46. MeowLover17
    • one year ago
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    ?

  47. welshfella
    • one year ago
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    the speed of car B will be different as i just read the values off the graph

  48. MeowLover17
    • one year ago
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    Oh okay so my second part of the answer is right but now i need to figure out the speed using the chart?

  49. welshfella
    • one year ago
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    speed = (40.05648 - 32.72904) / 10

  50. MeowLover17
    • one year ago
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    ok so its .732744

  51. MeowLover17
    • one year ago
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    So .732744 my average rate of change??

  52. welshfella
    • one year ago
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    kms / minute Yes

  53. welshfella
    • one year ago
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    yes

  54. MeowLover17
    • one year ago
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    Okay so my Anser for part D is

  55. MeowLover17
    • one year ago
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    The average rate of change is 0.732744 kms/minutes and this represents the car's average speed between times 20 and 30 minutes.

  56. MeowLover17
    • one year ago
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    Is that correct?

  57. welshfella
    • one year ago
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    yes

  58. MeowLover17
    • one year ago
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    Thanks for your help

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