anonymous
  • anonymous
I need help with question. Im gonna download question.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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anonymous
  • anonymous
@radar
anonymous
  • anonymous
who opens .docx anymore?

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anonymous
  • anonymous
you can open do docx
anonymous
  • anonymous
you need to use trigonometric functions
anonymous
  • anonymous
i got cos 50=x/90 right
anonymous
  • anonymous
so i got 57.9
anonymous
  • anonymous
The cosine of a 50° angle is 57.9 right
anonymous
  • anonymous
which part the first blank is asking which function to use to find the height
anonymous
  • anonymous
part 1 i think its cosine
anonymous
  • anonymous
if yo are using cos(50)=x/90
anonymous
  • anonymous
yes that's what i did
anonymous
  • anonymous
and i got 57.9
anonymous
  • anonymous
then the next part is asking for the reverse how do you find the cosine function with the two sides
anonymous
  • anonymous
57.8
anonymous
  • anonymous
then input the cosine of 50 in your calculator for the next blank
anonymous
  • anonymous
its asking this this represents the value created when length _____ is divided by ______ feet.
anonymous
  • anonymous
the angle is the value when you divide the sides accordingly
radar
  • radar
Cos 50 degrees is 0.6428
anonymous
  • anonymous
The cosine of a 50° angle is 57.9 is this right for the second part
anonymous
  • anonymous
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.
anonymous
  • anonymous
so like radar has said the cosine of 50 is .6428 so the sides divided are also .6428
anonymous
  • anonymous
57.8 is the height of the tower because you multiplied the hypotenuse by the cosine to find x
anonymous
  • anonymous
so it will be .6428x.6428
radar
  • radar
Cos is the adjacent side divided by the hypotenusel.
anonymous
  • anonymous
what happens if you divide the side x by the side of 90
anonymous
  • anonymous
adjacemt side is x right and hypotenusel is 90
anonymous
  • anonymous
so 57.8 divided by 90
anonymous
  • anonymous
that's what i got
radar
  • radar
\[\cos 50^{0}=x/90 ft\]
anonymous
  • anonymous
you get .6422
anonymous
  • anonymous
i got 57.9
anonymous
  • anonymous
roughly the same as the cosine for 50 degrees
radar
  • radar
\[x=.6428 \times90\]
anonymous
  • anonymous
|dw:1349577896978:dw|
anonymous
  • anonymous
that is what we have so far
anonymous
  • anonymous
so it would be 57.9
anonymous
  • anonymous
so x side is 57.9
radar
  • radar
Yes
radar
  • radar
when angle was 50 degrees
anonymous
  • anonymous
\[\cos(50^{0})=\frac{ adjacent }{ hypotenuse}\]
anonymous
  • anonymous
The cosine of a 50° angle is .6422 right
anonymous
  • anonymous
the first question only wanted to know that you would use the cosine function to find x
anonymous
  • anonymous
the next blank wants you to input the cosine of 50 which you have .6422
anonymous
  • anonymous
its .6428
anonymous
  • anonymous
yes if you type in cos50 in your calculator that is what you get
anonymous
  • anonymous
this represents the value created when length ____ is divided by ____ feet.
anonymous
  • anonymous
so what about this one
anonymous
  • anonymous
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
anonymous
  • anonymous
when length is 50 is divided by x feet right
anonymous
  • anonymous
no 50 is the angle you want the height of the tower divided by the lenght of the decline which is 90
anonymous
  • anonymous
when length is 90 divided by x feet
anonymous
  • anonymous
|dw:1349578522617:dw|
anonymous
  • anonymous
right
anonymous
  • anonymous
see how it is lenght x divided by 90 feet
anonymous
  • anonymous
ok i see now x/90
anonymous
  • anonymous
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
anonymous
  • anonymous
ok
anonymous
  • anonymous
If the angle of declination changed to 60°, the cosine would be 0.5; now the length of x would be ________ feet.
anonymous
  • anonymous
use the same equation with the cos of 60 instead
anonymous
  • anonymous
so its gonna be cos(60)=x/90
anonymous
  • anonymous
\[\cos(60^{0})=\frac{ x }{ 90ft }\]
anonymous
  • anonymous
so now you need to solve for x
anonymous
  • anonymous
so it would be 45
anonymous
  • anonymous
yes one more blank left
anonymous
  • anonymous
there is two ways to solve for this but you are suppose to use a trig function
anonymous
  • anonymous
there are srry
anonymous
  • anonymous
0.5
anonymous
  • anonymous
If the angle of declination changed to 60°, the angle of inclination would be _____ degrees.
anonymous
  • anonymous
no it wants to know the angle of inclination which is the angle from the bottom
anonymous
  • anonymous
|dw:1349579030126:dw|
radar
  • radar
|dw:1349579070499:dw|
anonymous
  • anonymous
the angel theta is unknown do you know which trig function to use to solve it
anonymous
  • anonymous
not sure
anonymous
  • anonymous
so theta is 60 degrees right
anonymous
  • anonymous
if you look at the trig functions there are sin=opposite / hypotenuse cos which we covered and tangent = opposite / adjacent
anonymous
  • anonymous
ok
anonymous
  • anonymous
so you want to use the sine function
radar
  • radar
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.
anonymous
  • anonymous
|dw:1349579230668:dw|
anonymous
  • anonymous
so apposite side is 45 right
anonymous
  • anonymous
yes
anonymous
  • anonymous
so we trying to find the bottom right
anonymous
  • anonymous
yes the bottom angle
anonymous
  • anonymous
on your calculator you push the 2nd button then 45/90
anonymous
  • anonymous
i got 0.5
anonymous
  • anonymous
you need the inverse sine of .5 which is 2nd sin .5
anonymous
  • anonymous
are you using a ti calculator
anonymous
  • anonymous
no my iphone
anonymous
  • anonymous
you need to look for \[\sin ^{-1}\]
anonymous
  • anonymous
ok
anonymous
  • anonymous
you press sin ^-1
anonymous
  • anonymous
and than 45/90
anonymous
  • anonymous
is that a button
anonymous
  • anonymous
yes its sin^(-1)
anonymous
  • anonymous
yes what do you get when you put that in
anonymous
  • anonymous
0.5
anonymous
  • anonymous
.5 is what you get when you do the division without the sine function I am not sure what your calculator is doing
anonymous
  • anonymous
when you get the true inverse sine you will get 30 degrees
anonymous
  • anonymous
i got 30
anonymous
  • anonymous
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
anonymous
  • anonymous
http://www.youtube.com/watch?v=T8B8Tcz8kog&feature=related
anonymous
  • anonymous
that is a link to a tutorial that might be able to help

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