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Solve for x. Round your answer to 2 decimal places.

Mathematics
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21.71 correct?
  • phi
how?

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Other answers:

looks u have used cos, u must use sin soh-cah
so, i tried again and got 14.90
  • phi
how? what steps are you taking?
sin opp/hyp
  • phi
that is a good start |dw:1350512679019:dw|
  • phi
can you fill in the numbers in sin( angle) = opp/hyp
the angles yess
then do that weird formula with A=(c+b)...
which now gave me 32.19
  • phi
what did you do?
sin(θ) = Opposite / Hypotenuse
  • phi
yes, but what numbers?
idk im lost idk my steps im getting it wrong its confusing me now
  • phi
Look at the picture. The angle is 34 degrees, right? I would replace θ with 34 in your equation sin(θ) = Opposite / Hypotenuse which side is opposite (look at my picture) how long is it?
90?
  • phi
90 is an angle (the right angle) the sides are the lines. I drew an arrow pointing at the line opposite the 34 degree angle
oh ok so 34/ hyp
couldnt i do pythergerium therom?
  • phi
34 is an angle. remember that you want the legs (the sides of the triangle)
  • phi
and we need to use trig here. pythagoras needs 2 sides (and no angles). But here we know 1 side and 1 angle. so we use trig. what is the length of the side opposite the 34 deg angle. look at the picture.
18
  • phi
yes. you replace opposite in sin(θ) = Opposite / Hypotenuse with 18. you replace θ with the angle 34 can you do that?
18/34
  • phi
pay attention: 34 is an angle. sin(θ) = Opposite / Hypotenuse means that the sin of an angle is opposite leg/ hypotenuse sin(34)= 18/x x because the picture calls the hypotenuse x now you need to solve for x can you do that ?
its 32.1 ! :DDDD
  • phi
just for info: If you are given 1+a and are told: replace a with 2, you would write 1+2 if your are given a/b and are told replace b with 3, you would write a/3 you need to do this "replace" to use these equations.
i got it its 32.1 !! :)
thank you so much for spending sooo much time on this with me !!!!
  • phi
how did you do it (it's right, BUT Round your answer to 2 decimal places.) but how did you do it?
32.19 i just re possisioned the sin(34)= 18/x
pluged it into the cal
to find x
  • phi
yes. You got it.
  • phi
if you have time, this video http://www.khanacademy.org/math/trigonometry/v/basic-trigonometry might be helpful. It helps me to see someone do the steps.

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