## Claire4christ Group Title I need help with question. Im gonna download question. one year ago one year ago

1. Claire4christ Group Title

2. Claire4christ Group Title

3. Algebraic! Group Title

who opens .docx anymore?

4. Claire4christ Group Title

you can open do docx

5. Decart Group Title

you need to use trigonometric functions

6. Claire4christ Group Title

i got cos 50=x/90 right

7. Claire4christ Group Title

so i got 57.9

8. Claire4christ Group Title

The cosine of a 50° angle is 57.9 right

9. Decart Group Title

which part the first blank is asking which function to use to find the height

10. Claire4christ Group Title

part 1 i think its cosine

11. Decart Group Title

if yo are using cos(50)=x/90

12. Claire4christ Group Title

yes that's what i did

13. Claire4christ Group Title

and i got 57.9

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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 Group Title

57.8

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then input the cosine of 50 in your calculator for the next blank

17. Claire4christ Group Title

its asking this this represents the value created when length _____ is divided by ______ feet.

18. Decart Group Title

the angle is the value when you divide the sides accordingly

Cos 50 degrees is 0.6428

20. Claire4christ Group Title

The cosine of a 50° angle is 57.9 is this right for the second part

21. Decart Group Title

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 Group Title

so like radar has said the cosine of 50 is .6428 so the sides divided are also .6428

23. Decart Group Title

57.8 is the height of the tower because you multiplied the hypotenuse by the cosine to find x

24. Claire4christ Group Title

so it will be .6428x.6428

Cos is the adjacent side divided by the hypotenusel.

26. Decart Group Title

what happens if you divide the side x by the side of 90

27. Claire4christ Group Title

adjacemt side is x right and hypotenusel is 90

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so 57.8 divided by 90

29. Claire4christ Group Title

that's what i got

$\cos 50^{0}=x/90 ft$

31. Decart Group Title

you get .6422

32. Claire4christ Group Title

i got 57.9

33. Decart Group Title

roughly the same as the cosine for 50 degrees

$x=.6428 \times90$

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that is what we have so far

37. Claire4christ Group Title

so it would be 57.9

38. Claire4christ Group Title

so x side is 57.9

Yes

when angle was 50 degrees

41. Decart Group Title

$\cos(50^{0})=\frac{ adjacent }{ hypotenuse}$

42. Claire4christ Group Title

The cosine of a 50° angle is .6422 right

43. Decart Group Title

the first question only wanted to know that you would use the cosine function to find x

44. Decart Group Title

the next blank wants you to input the cosine of 50 which you have .6422

45. Claire4christ Group Title

its .6428

46. Decart Group Title

yes if you type in cos50 in your calculator that is what you get

47. Claire4christ Group Title

this represents the value created when length ____ is divided by ____ feet.

48. Claire4christ Group Title

49. Decart Group Title

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 Group Title

when length is 50 is divided by x feet right

51. Decart Group Title

no 50 is the angle you want the height of the tower divided by the lenght of the decline which is 90

52. Claire4christ Group Title

when length is 90 divided by x feet

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54. Claire4christ Group Title

right

55. Decart Group Title

see how it is lenght x divided by 90 feet

56. Claire4christ Group Title

ok i see now x/90

57. Decart Group Title

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 Group Title

ok

59. Claire4christ Group Title

If the angle of declination changed to 60°, the cosine would be 0.5; now the length of x would be ________ feet.

60. Decart Group Title

use the same equation with the cos of 60 instead

61. Claire4christ Group Title

so its gonna be cos(60)=x/90

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$\cos(60^{0})=\frac{ x }{ 90ft }$

63. Decart Group Title

so now you need to solve for x

64. Claire4christ Group Title

so it would be 45

65. Decart Group Title

yes one more blank left

66. Decart Group Title

there is two ways to solve for this but you are suppose to use a trig function

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there are srry

68. Claire4christ Group Title

0.5

69. Claire4christ Group Title

If the angle of declination changed to 60°, the angle of inclination would be _____ degrees.

70. Decart Group Title

no it wants to know the angle of inclination which is the angle from the bottom

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73. Decart Group Title

the angel theta is unknown do you know which trig function to use to solve it

74. Claire4christ Group Title

not sure

75. Claire4christ Group Title

so theta is 60 degrees right

76. Decart Group Title

if you look at the trig functions there are sin=opposite / hypotenuse cos which we covered and tangent = opposite / adjacent

77. Claire4christ Group Title

ok

78. Decart Group Title

so you want to use the sine function

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.

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81. Claire4christ Group Title

so apposite side is 45 right

82. Decart Group Title

yes

83. Claire4christ Group Title

so we trying to find the bottom right

84. Decart Group Title

yes the bottom angle

85. Decart Group Title

on your calculator you push the 2nd button then 45/90

86. Claire4christ Group Title

i got 0.5

87. Decart Group Title

you need the inverse sine of .5 which is 2nd sin .5

88. Decart Group Title

are you using a ti calculator

89. Claire4christ Group Title

no my iphone

90. Decart Group Title

you need to look for $\sin ^{-1}$

91. Claire4christ Group Title

ok

92. Claire4christ Group Title

you press sin ^-1

93. Claire4christ Group Title

and than 45/90

94. Decart Group Title

is that a button

95. Claire4christ Group Title

yes its sin^(-1)

96. Decart Group Title

yes what do you get when you put that in

97. Claire4christ Group Title

0.5

98. Decart Group Title

.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 Group Title

when you get the true inverse sine you will get 30 degrees

100. Claire4christ Group Title

i got 30

101. Decart Group Title

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 Group Title
103. Decart Group Title

that is a link to a tutorial that might be able to help