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anonymous

  • one year ago

The image shows a portion of a bridge supported by vertical pillars from the slope below. What is the length of the bridge between pillar B and pillar C?

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    Use pythagoras theorem for this question, both of em are similar triangles

  3. anonymous
    • one year ago
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    I honestly do not know how to.

  4. anonymous
    • one year ago
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    i cant really help you the image is really fuzzy

  5. anonymous
    • one year ago
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    and i dont run csi enhancer

  6. anonymous
    • one year ago
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    do you know how to do the process you were talking about ? could you explain to me how to ?

  7. anonymous
    • one year ago
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    ok lets start by finding this angle|dw:1438434416019:dw|

  8. anonymous
    • one year ago
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    29 feet 48 feet 56 feet 60 feet those are my options btw. And alright.

  9. anonymous
    • one year ago
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    \[\cos^{-1} (\frac{ 40 }{ 50 }) is the \angle\]

  10. anonymous
    • one year ago
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    cos^1 (40/50) is the angle

  11. anonymous
    • one year ago
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    im really confused.

  12. anonymous
    • one year ago
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    |dw:1438434482105:dw|

  13. anonymous
    • one year ago
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    okay from a to b on the top is 40 feet, bottom is 50 feet. and b to c on bottom is 70 feet, does that help ?

  14. anonymous
    • one year ago
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    \[\frac{ 50 }{ 120 } = \frac{ 40 }{ 40+x }\]

  15. anonymous
    • one year ago
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    now you can solve for x

  16. anonymous
    • one year ago
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    you can do that i hope

  17. anonymous
    • one year ago
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    i got 80 .. i feel like im wrong ... I havent had a math class since my freshman year in high school, and this is my senior year, and i just honestly dont have any idea what im doing ... i feel really stupid right now.

  18. anonymous
    • one year ago
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    lemme try solving\[\frac{ 50 }{ 120 } = \frac{ 40 }{ 40+x }\]\[50 = \frac{ 4800 }{ 40+x }\]\[50(40+x)=4800\]\[2000+50x=4800\]\[50x=2800\]\[x=56\]

  19. anonymous
    • one year ago
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    thank you ... But can i ask how you did that process ? if its too much to explain thats fine.

  20. anonymous
    • one year ago
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    alright you just cross multiple the denominator to each sides to cancel them out (the 1st 2 lines).

  21. anonymous
    • one year ago
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    cause fractions are messy. then you move the constant to one side of the equation (3rd line), by minus-ing the constant (2000) from both sides.

  22. anonymous
    • one year ago
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    thats how we end up with 50x=2800

  23. anonymous
    • one year ago
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    This whole thing confuses me. I literally feel dumb. I don't understand any of this.

  24. anonymous
    • one year ago
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    which part you do not understand?

  25. anonymous
    • one year ago
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    All of it... I don't even have a teacher, like i have to teach myself all of this stuff. Im probably wasting your time honestly, I cant comprehend this kind of stuff.

  26. anonymous
    • one year ago
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    ok ill write it in simpler form

  27. anonymous
    • one year ago
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    You don't have to do that..

  28. anonymous
    • one year ago
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    you gotta know how we come out with that first....

  29. anonymous
    • one year ago
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    otherwise you will keep getting stuck

  30. anonymous
    • one year ago
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    I just dont want to waste your time. And i don't think ill ever understand this.

  31. anonymous
    • one year ago
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    well just take it easy, 1 thing at a time

  32. anonymous
    • one year ago
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    okay..

  33. anonymous
    • one year ago
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    ill explain to you how the\[\frac{ 50 }{ 120 } = \frac{ 40 }{ 40+x }\] is made first

  34. anonymous
    • one year ago
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    the triangle in the diagram is a similar triangle, therefore they are proportional to each other|dw:1438436528358:dw|

  35. anonymous
    • one year ago
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    okay

  36. anonymous
    • one year ago
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    50+70 is how we got the 120., and we take the ratio of the smaller triangle to the larger one

  37. anonymous
    • one year ago
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    ratio ?

  38. anonymous
    • one year ago
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    yea the fraction you saw 50/120 is the ratio

  39. anonymous
    • one year ago
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    okay.

  40. anonymous
    • one year ago
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    now the other side of the triangle is 40 on small side and 40+x on larger side

  41. anonymous
    • one year ago
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    they have to be proportional because they are co-linear so the ratio (that fraction) must be equal

  42. anonymous
    • one year ago
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    okay.

  43. anonymous
    • one year ago
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    you can understand that?

  44. anonymous
    • one year ago
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    i think.

  45. anonymous
    • one year ago
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    lemme try draw something to show you what i mean|dw:1438437049240:dw|

  46. anonymous
    • one year ago
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    okay

  47. anonymous
    • one year ago
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    like this in case the ratio of the triangle is 1:2 or 1/2

  48. anonymous
    • one year ago
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    its similar as the question you had but the proportion is not so straightforward

  49. anonymous
    • one year ago
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    so we use the ratio to find the distance of 40+x, with the ratio of the 50/120

  50. anonymous
    • one year ago
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    I have to go. Can we finish this later ?

  51. anonymous
    • one year ago
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    sure and see ya!

  52. anonymous
    • one year ago
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    okay , thank you. i gave you a medal.

  53. anonymous
    • one year ago
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    thank you

  54. anonymous
    • one year ago
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    no problem.

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