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rebeccaskell94

@SmoothMath I need your help D: Use △DEF, shown below, to answer the question that follows. http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/pool_Geom_3641_0402_02/0402_G2_Q3.gif What is the value of x rounded to the nearest hundredth?

  • one year ago
  • one year ago

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  1. SmoothMath
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    What have you tried so far?

    • one year ago
  2. mathslover
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    |dw:1341504473383:dw|

    • one year ago
  3. SmoothMath
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    This is very similar to the kind of problem I taught you before.

    • one year ago
  4. rebeccaskell94
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    Well I looked at the triangle and saw that like EF is opposite and DE is adjacent sooo I use tan?

    • one year ago
  5. SmoothMath
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    Very good. Keep going. Use tangent to set up the equation.

    • one year ago
  6. mathslover
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    soa cah toa .. tan (theta)= opposite / adjacent .. good u r going right best of luck

    • one year ago
  7. SmoothMath
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    soh cah toa*

    • one year ago
  8. ivandelgado6
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    SmoothMath help me

    • one year ago
  9. SmoothMath
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    Sorry, Becca is cuter.

    • one year ago
  10. rebeccaskell94
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    :3> xD thanks Okay, um Tan(45) = x/55 ?

    • one year ago
  11. rebeccaskell94
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    x= 2,475

    • one year ago
  12. SmoothMath
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    Looks good. Solve for x and then round to the nearest hundredth like they ask.

    • one year ago
  13. SmoothMath
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    Oh wait. One problem with your equation. The angle isn't 45.

    • one year ago
  14. rebeccaskell94
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    lol derp. 49 Tan(49) = x/55 x= 2,695

    • one year ago
  15. rebeccaskell94
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    or just 2700

    • one year ago
  16. SmoothMath
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    I don't know what you did, but 2,695 is super super off.

    • one year ago
  17. rebeccaskell94
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    D: I thought it was 49 x 55 to find out x to then divide it and then make it like...right =2695/55 = 49

    • one year ago
  18. SmoothMath
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    TANGENT of 49... super different from 49. Use your calculator to find out what tan(49) is. Make sure you're in degrees and not radians.

    • one year ago
  19. SmoothMath
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    tan(49) = x/55 Just solve for x, then let your calculator do the trig function for you.

    • one year ago
  20. rebeccaskell94
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    my calculator doesn't do anything but x/55

    • one year ago
  21. SmoothMath
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    It really doesn't have sin cos tan buttons on it? You'll need to use a different calculator then, or else use google or alpha.

    • one year ago
  22. rebeccaskell94
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    This is what I use http://web2.0calc.com/

    • one year ago
  23. rebeccaskell94
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    Or is it just the 1.15 thing

    • one year ago
  24. rebeccaskell94
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    ohhh like tan(49) = 1.15/55 ?

    • one year ago
  25. SmoothMath
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    Far left, below pi, you'll see the buttons sin, cos, and tan. Those are your trig functions. To do this one, click tan, then 49, then ). Should look like this: I've boxed the trig function buttons in blue and the way to switch between degrees and radian modes in green.

    • one year ago
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  26. SmoothMath
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    Becca, please don't forget how to do simple algebra. tan(49) = x/55 How do you solve for x?

    • one year ago
  27. rebeccaskell94
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    49/1 • x/55? ... My brain...it's dying. :(

    • one year ago
  28. SmoothMath
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    multiply both sides by 55. -_-

    • one year ago
  29. rebeccaskell94
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    -__- dollface 49 • 55 and x/55 • 55?

    • one year ago
  30. SmoothMath
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    not 49*55. tan(49)*55

    • one year ago
  31. SmoothMath
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    and what is x/55 * 55?

    • one year ago
  32. rebeccaskell94
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    1?

    • one year ago
  33. SmoothMath
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    oh my goodness. Becca, can you solve this equation for me? 4 = x/2

    • one year ago
  34. rebeccaskell94
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    8

    • one year ago
  35. SmoothMath
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    Same dang thing here. tan(49) = x/55

    • one year ago
  36. Wolfboy
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    55*49.........

    • one year ago
  37. SmoothMath
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    Wrong, wolfboy.

    • one year ago
  38. rebeccaskell94
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    Its not just 55*49 D: he said it's tan(49) :(

    • one year ago
  39. SmoothMath
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    55* tan(49)

    • one year ago
  40. Wolfboy
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    I. Thought sooo......hmmmmmm

    • one year ago
  41. Wolfboy
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    Sooo we need the formula for tan or a couculater

    • one year ago
  42. rebeccaskell94
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    63.27?

    • one year ago
  43. SmoothMath
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    Yes. Let me just show you the last 2 steps. You got as far as tan(49) = x/55 multiply both sides by 55. That's basic algebra, solving for x. 55*tan(49) = x tan of 49, when you put in your calculator is 1.15036841 and 55*(1.15036841) = 63.2702625 then, of course you round to the nearest hundredth.

    • one year ago
  44. rebeccaskell94
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    Thank you dollface :D Sorry if I frustrated you :c

    • one year ago
  45. SmoothMath
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    You didn't, cutesie buttons. I'm happy to help. =)

    • one year ago
  46. rebeccaskell94
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    Yay :D

    • one year ago
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