Claire4christ
I need help with question. Im gonna download question.
Delete
Share
This Question is Closed
Claire4christ
Best Response
You've already chosen the best response.
0
Claire4christ
Best Response
You've already chosen the best response.
0
@radar
Algebraic!
Best Response
You've already chosen the best response.
0
who opens .docx anymore?
Claire4christ
Best Response
You've already chosen the best response.
0
you can open do docx
Decart
Best Response
You've already chosen the best response.
1
you need to use trigonometric functions
Claire4christ
Best Response
You've already chosen the best response.
0
i got cos 50=x/90 right
Claire4christ
Best Response
You've already chosen the best response.
0
so i got 57.9
Claire4christ
Best Response
You've already chosen the best response.
0
The cosine of a 50° angle is 57.9 right
Decart
Best Response
You've already chosen the best response.
1
which part the first blank is asking which function to use to find the height
Claire4christ
Best Response
You've already chosen the best response.
0
part 1 i think its cosine
Decart
Best Response
You've already chosen the best response.
1
if yo are using cos(50)=x/90
Claire4christ
Best Response
You've already chosen the best response.
0
yes that's what i did
Claire4christ
Best Response
You've already chosen the best response.
0
and i got 57.9
Decart
Best Response
You've already chosen the best response.
1
then the next part is asking for the reverse how do you find the cosine function with the two sides
Decart
Best Response
You've already chosen the best response.
1
57.8
Decart
Best Response
You've already chosen the best response.
1
then input the cosine of 50 in your calculator for the next blank
Claire4christ
Best Response
You've already chosen the best response.
0
its asking this this represents the value created when length _____ is divided by ______ feet.
Decart
Best Response
You've already chosen the best response.
1
the angle is the value when you divide the sides accordingly
radar
Best Response
You've already chosen the best response.
0
Cos 50 degrees is 0.6428
Claire4christ
Best Response
You've already chosen the best response.
0
The cosine of a 50° angle is 57.9 is this right for the second part
Decart
Best Response
You've already chosen the best response.
1
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.
Decart
Best Response
You've already chosen the best response.
1
so like radar has said the cosine of 50 is .6428
so the sides divided are also .6428
Decart
Best Response
You've already chosen the best response.
1
57.8 is the height of the tower because you multiplied the hypotenuse by the cosine to find x
Claire4christ
Best Response
You've already chosen the best response.
0
so it will be .6428x.6428
radar
Best Response
You've already chosen the best response.
0
Cos is the adjacent side divided by the hypotenusel.
Decart
Best Response
You've already chosen the best response.
1
what happens if you divide the side x by the side of 90
Claire4christ
Best Response
You've already chosen the best response.
0
adjacemt side is x right
and hypotenusel is 90
Decart
Best Response
You've already chosen the best response.
1
so 57.8 divided by 90
Claire4christ
Best Response
You've already chosen the best response.
0
that's what i got
radar
Best Response
You've already chosen the best response.
0
\[\cos 50^{0}=x/90 ft\]
Decart
Best Response
You've already chosen the best response.
1
you get .6422
Claire4christ
Best Response
You've already chosen the best response.
0
i got 57.9
Decart
Best Response
You've already chosen the best response.
1
roughly the same as the cosine for 50 degrees
radar
Best Response
You've already chosen the best response.
0
\[x=.6428 \times90\]
Decart
Best Response
You've already chosen the best response.
1
|dw:1349577896978:dw|
Decart
Best Response
You've already chosen the best response.
1
that is what we have so far
Claire4christ
Best Response
You've already chosen the best response.
0
so it would be 57.9
Claire4christ
Best Response
You've already chosen the best response.
0
so x side is 57.9
radar
Best Response
You've already chosen the best response.
0
Yes
radar
Best Response
You've already chosen the best response.
0
when angle was 50 degrees
Decart
Best Response
You've already chosen the best response.
1
\[\cos(50^{0})=\frac{ adjacent }{ hypotenuse}\]
Claire4christ
Best Response
You've already chosen the best response.
0
The cosine of a 50° angle is .6422 right
Decart
Best Response
You've already chosen the best response.
1
the first question only wanted to know that you would use the cosine function to find x
Decart
Best Response
You've already chosen the best response.
1
the next blank wants you to input the cosine of 50 which you have .6422
Claire4christ
Best Response
You've already chosen the best response.
0
its .6428
Decart
Best Response
You've already chosen the best response.
1
yes if you type in cos50 in your calculator that is what you get
Claire4christ
Best Response
You've already chosen the best response.
0
this represents the value created when length ____ is divided by ____ feet.
Claire4christ
Best Response
You've already chosen the best response.
0
so what about this one
Decart
Best Response
You've already chosen the best response.
1
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
Claire4christ
Best Response
You've already chosen the best response.
0
when length is 50 is divided by x feet right
Decart
Best Response
You've already chosen the best response.
1
no 50 is the angle you want the height of the tower divided by the lenght of the decline which is 90
Claire4christ
Best Response
You've already chosen the best response.
0
when length is 90 divided by x feet
Decart
Best Response
You've already chosen the best response.
1
|dw:1349578522617:dw|
Claire4christ
Best Response
You've already chosen the best response.
0
right
Decart
Best Response
You've already chosen the best response.
1
see how it is lenght x divided by 90 feet
Claire4christ
Best Response
You've already chosen the best response.
0
ok i see now
x/90
Decart
Best Response
You've already chosen the best response.
1
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
Claire4christ
Best Response
You've already chosen the best response.
0
ok
Claire4christ
Best Response
You've already chosen the best response.
0
If the angle of declination changed to 60°, the cosine would be 0.5; now the length of x would be ________ feet.
Decart
Best Response
You've already chosen the best response.
1
use the same equation with the cos of 60 instead
Claire4christ
Best Response
You've already chosen the best response.
0
so its gonna be cos(60)=x/90
Decart
Best Response
You've already chosen the best response.
1
\[\cos(60^{0})=\frac{ x }{ 90ft }\]
Decart
Best Response
You've already chosen the best response.
1
so now you need to solve for x
Claire4christ
Best Response
You've already chosen the best response.
0
so it would be 45
Decart
Best Response
You've already chosen the best response.
1
yes one more blank left
Decart
Best Response
You've already chosen the best response.
1
there is two ways to solve for this but you are suppose to use a trig function
Decart
Best Response
You've already chosen the best response.
1
there are srry
Claire4christ
Best Response
You've already chosen the best response.
0
0.5
Claire4christ
Best Response
You've already chosen the best response.
0
If the angle of declination changed to 60°, the angle of inclination would be _____ degrees.
Decart
Best Response
You've already chosen the best response.
1
no it wants to know the angle of inclination which is the angle from the bottom
Decart
Best Response
You've already chosen the best response.
1
|dw:1349579030126:dw|
radar
Best Response
You've already chosen the best response.
0
|dw:1349579070499:dw|
Decart
Best Response
You've already chosen the best response.
1
the angel theta is unknown do you know which trig function to use to solve it
Claire4christ
Best Response
You've already chosen the best response.
0
not sure
Claire4christ
Best Response
You've already chosen the best response.
0
so theta is 60 degrees right
Decart
Best Response
You've already chosen the best response.
1
if you look at the trig functions there are sin=opposite / hypotenuse cos which we covered and tangent = opposite / adjacent
Claire4christ
Best Response
You've already chosen the best response.
0
ok
Decart
Best Response
You've already chosen the best response.
1
so you want to use the sine function
radar
Best Response
You've already chosen the best response.
0
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.
Decart
Best Response
You've already chosen the best response.
1
|dw:1349579230668:dw|
Claire4christ
Best Response
You've already chosen the best response.
0
so apposite side is 45 right
Decart
Best Response
You've already chosen the best response.
1
yes
Claire4christ
Best Response
You've already chosen the best response.
0
so we trying to find the bottom right
Decart
Best Response
You've already chosen the best response.
1
yes the bottom angle
Decart
Best Response
You've already chosen the best response.
1
on your calculator you push the 2nd button then 45/90
Claire4christ
Best Response
You've already chosen the best response.
0
i got 0.5
Decart
Best Response
You've already chosen the best response.
1
you need the inverse sine of .5 which is 2nd sin .5
Decart
Best Response
You've already chosen the best response.
1
are you using a ti calculator
Claire4christ
Best Response
You've already chosen the best response.
0
no my iphone
Decart
Best Response
You've already chosen the best response.
1
you need to look for \[\sin ^{-1}\]
Claire4christ
Best Response
You've already chosen the best response.
0
ok
Claire4christ
Best Response
You've already chosen the best response.
0
you press sin ^-1
Claire4christ
Best Response
You've already chosen the best response.
0
and than 45/90
Decart
Best Response
You've already chosen the best response.
1
is that a button
Claire4christ
Best Response
You've already chosen the best response.
0
yes
its sin^(-1)
Decart
Best Response
You've already chosen the best response.
1
yes what do you get when you put that in
Claire4christ
Best Response
You've already chosen the best response.
0
0.5
Decart
Best Response
You've already chosen the best response.
1
.5 is what you get when you do the division without the sine function I am not sure what your calculator is doing
Decart
Best Response
You've already chosen the best response.
1
when you get the true inverse sine you will get 30 degrees
Claire4christ
Best Response
You've already chosen the best response.
0
i got 30
Decart
Best Response
You've already chosen the best response.
1
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
Decart
Best Response
You've already chosen the best response.
1
that is a link to a tutorial that might be able to help