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anonymous

  • 4 years ago

Math question help please !

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  1. anonymous
    • 4 years ago
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    what is the question?

  2. anonymous
    • 4 years ago
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    3 CD is a water pipeline. A and B are two towns. A pumping station is to be located on the pipeline to pump water to A and B. Each town is to pay for their own service pipes and insist on equality of costs. a Where should C be located for equality of costs to occur? b What is the total length of service pipe re- quired? c If the towns agree to pay equal amounts, would it be cheaper to install the service pipeline from D to B to A?

  3. anonymous
    • 4 years ago
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    using the graph from this website http://www.haesemathematics.com.au/samples/sa11gt-5_02.pdf

  4. anonymous
    • 4 years ago
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    page 83: number 3

  5. anonymous
    • 4 years ago
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    |dw:1327729372654:dw|

  6. anonymous
    • 4 years ago
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    A(2,3) B(5,4)

  7. anonymous
    • 4 years ago
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    Is anybody answering this?

  8. anonymous
    • 4 years ago
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    not me- i forgot how 2, same question i had last year =P all urs

  9. anonymous
    • 4 years ago
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    kk :) ill try it

  10. anonymous
    • 4 years ago
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    i found A but im confused on parts B and C

  11. anonymous
    • 4 years ago
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    wait, are you doing the IB?

  12. anonymous
    • 4 years ago
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    yes

  13. anonymous
    • 4 years ago
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    haha, yeah, I'm using the same textbook. Ill post the answers in a few minutes. I'm writing it out.

  14. anonymous
    • 4 years ago
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    alright thank you !

  15. anonymous
    • 4 years ago
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    ok so is the first one 7/3?

  16. anonymous
    • 4 years ago
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    yess

  17. anonymous
    • 4 years ago
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    do you know how to do that?

  18. anonymous
    • 4 years ago
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    for the second part i got confused on what is the total distance

  19. anonymous
    • 4 years ago
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    i used the distance formula for both AC & BC made them equal eachother

  20. anonymous
    • 4 years ago
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    What do they give for an answer??

  21. anonymous
    • 4 years ago
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    7/3 for A

  22. anonymous
    • 4 years ago
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    for C: 8.03km

  23. anonymous
    • 4 years ago
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    i mean for B

  24. anonymous
    • 4 years ago
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    and for C yes (6.16 km)

  25. anonymous
    • 4 years ago
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    yes, it makes sense

  26. anonymous
    • 4 years ago
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    part b is 8.03(i got 8.027 lol)

  27. anonymous
    • 4 years ago
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    rounded up for B

  28. anonymous
    • 4 years ago
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    but how did you get B?

  29. anonymous
    • 4 years ago
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    all you need to do is take one set of the coordinates like (2,3) and use the coordinate of the pipeline and put them into the distance formula. (7/3, 7) You get around 4.0138646..... multiply that by two as there are two service pipes, one for B and one for A and you get 8.027 or 8.03 as they say

  30. anonymous
    • 4 years ago
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    so get the distance between the two points and times it by 2?

  31. anonymous
    • 4 years ago
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    yes...getting the distance for one only gives you the cost for one service pipeline. That only gives water to either A or B. Both need it right?

  32. anonymous
    • 4 years ago
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    yeahh..

  33. anonymous
    • 4 years ago
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    and the second one is 6.16 and yes. the distance from B to D is 3(just subtract the y-values) the distance from B to A is 3.16(distance formula should give you sqrt 10 which is 3.16 in decimal) add them together and you get 6.16 which is a shorter distance then 8.03 so it would be cheaper.

  34. anonymous
    • 4 years ago
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    can you do 3b because i got 8.11

  35. anonymous
    • 4 years ago
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    nevermind i did it the wrong way !

  36. anonymous
    • 4 years ago
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    but im kindda lost on 3C

  37. anonymous
    • 4 years ago
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    ok...so what do you need to get in 3C? the distance from D to B to A right?

  38. anonymous
    • 4 years ago
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    so i need to find D for 3c

  39. anonymous
    • 4 years ago
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    for finding D what points do i use? A and B right?

  40. anonymous
    • 4 years ago
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    noooo, no, why would you need to? the right angle sign indicates that it is a straight line going down.

  41. anonymous
    • 4 years ago
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    ohhh so if i find d to b i can get b to a

  42. anonymous
    • 4 years ago
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    |dw:1327731671265:dw|

  43. anonymous
    • 4 years ago
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    do you get it?

  44. anonymous
    • 4 years ago
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    yes i got it !

  45. anonymous
    • 4 years ago
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    can you help me with with the next question?

  46. anonymous
    • 4 years ago
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    the one where it says "jason's girlfriend lives in a house on China..."

  47. anonymous
    • 4 years ago
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    ok!

  48. anonymous
    • 4 years ago
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    thanks !

  49. anonymous
    • 4 years ago
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    wait, is it possible for you to write or screen shot the question because my preview just froze from all the pdfs :S sryy

  50. anonymous
    • 4 years ago
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    Jason's girlfriend lives in a house on Clifton Highway which has equation y = 8. The distance from Jason's house is 11.73 km. If Jason lives at J(4,1), what are the coordinates of his girlfriend's house? y=8 o-------------------------------------… <- Clifton Highway K(a,8) -- let x = a Distance JK = 11.73 km = 11.73 units o J(4,1) Scale: 1 unit = 1 km Okay legend: o (small o) represents a point. Point K is imaginary (I placed it there for visual reference i.e. lets pretend that its there, you are trying to find the x value. Point K is the location of Jason's girlfriend's house. And the distance between their houses is 11.73

  51. anonymous
    • 4 years ago
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    ok, what's the answer it gives?

  52. anonymous
    • 4 years ago
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    im guessing -5.41

  53. anonymous
    • 4 years ago
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    yeah i got the probblem !

  54. anonymous
    • 4 years ago
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    ??you got how to do it?

  55. anonymous
    • 4 years ago
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    all right :) good job XD

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