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Claire4christ

  • 2 years ago

I need help with question. Im gonna download question.

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  1. Claire4christ
    • 2 years ago
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  2. Claire4christ
    • 2 years ago
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    @radar

  3. Algebraic!
    • 2 years ago
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    who opens .docx anymore?

  4. Claire4christ
    • 2 years ago
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    you can open do docx

  5. Decart
    • 2 years ago
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    you need to use trigonometric functions

  6. Claire4christ
    • 2 years ago
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    i got cos 50=x/90 right

  7. Claire4christ
    • 2 years ago
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    so i got 57.9

  8. Claire4christ
    • 2 years ago
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    The cosine of a 50° angle is 57.9 right

  9. Decart
    • 2 years ago
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    which part the first blank is asking which function to use to find the height

  10. Claire4christ
    • 2 years ago
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    part 1 i think its cosine

  11. Decart
    • 2 years ago
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    if yo are using cos(50)=x/90

  12. Claire4christ
    • 2 years ago
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    yes that's what i did

  13. Claire4christ
    • 2 years ago
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    and i got 57.9

  14. Decart
    • 2 years ago
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    then the next part is asking for the reverse how do you find the cosine function with the two sides

  15. Decart
    • 2 years ago
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    57.8

  16. Decart
    • 2 years ago
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    then input the cosine of 50 in your calculator for the next blank

  17. Claire4christ
    • 2 years ago
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    its asking this this represents the value created when length _____ is divided by ______ feet.

  18. Decart
    • 2 years ago
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    the angle is the value when you divide the sides accordingly

  19. radar
    • 2 years ago
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    Cos 50 degrees is 0.6428

  20. Claire4christ
    • 2 years ago
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    The cosine of a 50° angle is 57.9 is this right for the second part

  21. Decart
    • 2 years ago
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    all the trig functions are is a relationship between the lengths of sides if you divide two known sides and take that data it represents and angle.

  22. Decart
    • 2 years ago
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    so like radar has said the cosine of 50 is .6428 so the sides divided are also .6428

  23. Decart
    • 2 years ago
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    57.8 is the height of the tower because you multiplied the hypotenuse by the cosine to find x

  24. Claire4christ
    • 2 years ago
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    so it will be .6428x.6428

  25. radar
    • 2 years ago
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    Cos is the adjacent side divided by the hypotenusel.

  26. Decart
    • 2 years ago
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    what happens if you divide the side x by the side of 90

  27. Claire4christ
    • 2 years ago
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    adjacemt side is x right and hypotenusel is 90

  28. Decart
    • 2 years ago
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    so 57.8 divided by 90

  29. Claire4christ
    • 2 years ago
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    that's what i got

  30. radar
    • 2 years ago
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    \[\cos 50^{0}=x/90 ft\]

  31. Decart
    • 2 years ago
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    you get .6422

  32. Claire4christ
    • 2 years ago
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    i got 57.9

  33. Decart
    • 2 years ago
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    roughly the same as the cosine for 50 degrees

  34. radar
    • 2 years ago
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    \[x=.6428 \times90\]

  35. Decart
    • 2 years ago
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    |dw:1349577896978:dw|

  36. Decart
    • 2 years ago
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    that is what we have so far

  37. Claire4christ
    • 2 years ago
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    so it would be 57.9

  38. Claire4christ
    • 2 years ago
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    so x side is 57.9

  39. radar
    • 2 years ago
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    Yes

  40. radar
    • 2 years ago
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    when angle was 50 degrees

  41. Decart
    • 2 years ago
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    \[\cos(50^{0})=\frac{ adjacent }{ hypotenuse}\]

  42. Claire4christ
    • 2 years ago
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    The cosine of a 50° angle is .6422 right

  43. Decart
    • 2 years ago
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    the first question only wanted to know that you would use the cosine function to find x

  44. Decart
    • 2 years ago
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    the next blank wants you to input the cosine of 50 which you have .6422

  45. Claire4christ
    • 2 years ago
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    its .6428

  46. Decart
    • 2 years ago
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    yes if you type in cos50 in your calculator that is what you get

  47. Claire4christ
    • 2 years ago
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    this represents the value created when length ____ is divided by ____ feet.

  48. Claire4christ
    • 2 years ago
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    so what about this one

  49. Decart
    • 2 years ago
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    if you look at the funtion you know that it is x divided by the 90 feet if you divide the value you got for x by 90 it is about the same as cos 50

  50. Claire4christ
    • 2 years ago
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    when length is 50 is divided by x feet right

  51. Decart
    • 2 years ago
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    no 50 is the angle you want the height of the tower divided by the lenght of the decline which is 90

  52. Claire4christ
    • 2 years ago
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    when length is 90 divided by x feet

  53. Decart
    • 2 years ago
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    |dw:1349578522617:dw|

  54. Claire4christ
    • 2 years ago
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    right

  55. Decart
    • 2 years ago
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    see how it is lenght x divided by 90 feet

  56. Claire4christ
    • 2 years ago
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    ok i see now x/90

  57. Decart
    • 2 years ago
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    that is a balanced equation if you divide that you get the same value as you did when you input cos of 50 into your calculator

  58. Claire4christ
    • 2 years ago
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    ok

  59. Claire4christ
    • 2 years ago
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    If the angle of declination changed to 60°, the cosine would be 0.5; now the length of x would be ________ feet.

  60. Decart
    • 2 years ago
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    use the same equation with the cos of 60 instead

  61. Claire4christ
    • 2 years ago
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    so its gonna be cos(60)=x/90

  62. Decart
    • 2 years ago
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    \[\cos(60^{0})=\frac{ x }{ 90ft }\]

  63. Decart
    • 2 years ago
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    so now you need to solve for x

  64. Claire4christ
    • 2 years ago
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    so it would be 45

  65. Decart
    • 2 years ago
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    yes one more blank left

  66. Decart
    • 2 years ago
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    there is two ways to solve for this but you are suppose to use a trig function

  67. Decart
    • 2 years ago
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    there are srry

  68. Claire4christ
    • 2 years ago
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    0.5

  69. Claire4christ
    • 2 years ago
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    If the angle of declination changed to 60°, the angle of inclination would be _____ degrees.

  70. Decart
    • 2 years ago
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    no it wants to know the angle of inclination which is the angle from the bottom

  71. Decart
    • 2 years ago
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    |dw:1349579030126:dw|

  72. radar
    • 2 years ago
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    |dw:1349579070499:dw|

  73. Decart
    • 2 years ago
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    the angel theta is unknown do you know which trig function to use to solve it

  74. Claire4christ
    • 2 years ago
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    not sure

  75. Claire4christ
    • 2 years ago
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    so theta is 60 degrees right

  76. Decart
    • 2 years ago
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    if you look at the trig functions there are sin=opposite / hypotenuse cos which we covered and tangent = opposite / adjacent

  77. Claire4christ
    • 2 years ago
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    ok

  78. Decart
    • 2 years ago
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    so you want to use the sine function

  79. radar
    • 2 years ago
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    From reading the problem, I believe you could solve simply from the fact you are working with a right triangle, and the sum of the two acute angles equals 90 degrees.

  80. Decart
    • 2 years ago
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    |dw:1349579230668:dw|

  81. Claire4christ
    • 2 years ago
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    so apposite side is 45 right

  82. Decart
    • 2 years ago
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    yes

  83. Claire4christ
    • 2 years ago
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    so we trying to find the bottom right

  84. Decart
    • 2 years ago
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    yes the bottom angle

  85. Decart
    • 2 years ago
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    on your calculator you push the 2nd button then 45/90

  86. Claire4christ
    • 2 years ago
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    i got 0.5

  87. Decart
    • 2 years ago
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    you need the inverse sine of .5 which is 2nd sin .5

  88. Decart
    • 2 years ago
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    are you using a ti calculator

  89. Claire4christ
    • 2 years ago
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    no my iphone

  90. Decart
    • 2 years ago
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    you need to look for \[\sin ^{-1}\]

  91. Claire4christ
    • 2 years ago
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    ok

  92. Claire4christ
    • 2 years ago
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    you press sin ^-1

  93. Claire4christ
    • 2 years ago
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    and than 45/90

  94. Decart
    • 2 years ago
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    is that a button

  95. Claire4christ
    • 2 years ago
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    yes its sin^(-1)

  96. Decart
    • 2 years ago
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    yes what do you get when you put that in

  97. Claire4christ
    • 2 years ago
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    0.5

  98. Decart
    • 2 years ago
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    .5 is what you get when you do the division without the sine function I am not sure what your calculator is doing

  99. Decart
    • 2 years ago
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    when you get the true inverse sine you will get 30 degrees

  100. Claire4christ
    • 2 years ago
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    i got 30

  101. Decart
    • 2 years ago
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    that is correct know do you notice that the 30 you got and the 60 degree other angle add up to 90 and the right angle is also 90 every triangle has 180 degrees in it so you could have just found the missing amount from 180

  102. Decart
    • 2 years ago
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    http://www.youtube.com/watch?v=T8B8Tcz8kog&feature=related

  103. Decart
    • 2 years ago
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    that is a link to a tutorial that might be able to help

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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