Mathematics
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OpenStudy (shaleiah):
Medal
For helping me solve this question.
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OpenStudy (shaleiah):
Do I use sine or tan to solve?
OpenStudy (z4k4r1y4):
for 'y' yes
OpenStudy (z4k4r1y4):
for 'x' it's cos
OpenStudy (shaleiah):
@Z4K4R1Y4 Like this? cos(30)/20 sqrt 3?
OpenStudy (z4k4r1y4):
no,
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OpenStudy (z4k4r1y4):
the fractions the other way around
OpenStudy (z4k4r1y4):
\[\cos 30=\frac{ 20\sqrt{3} }{ x}\]
OpenStudy (shaleiah):
The value I got is 40
OpenStudy (joannablackwelder):
It looks like to me that the hyos is the 20sqrt3. So that should be in the denominator.
OpenStudy (joannablackwelder):
*hyp
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OpenStudy (z4k4r1y4):
becomes \[x = \frac{ 20\sqrt{3} }{ \cos 30 }\]
OpenStudy (z4k4r1y4):
oh yh sorry my mistake. thanks @JoannaBlackwelder
OpenStudy (joannablackwelder):
No worries. Do you see why we are using cos with x @shaleiah ?
OpenStudy (shaleiah):
adj/hpo?
OpenStudy (joannablackwelder):
Right, since x is adj to the 30 degree angle and the 20sqrt(3) is the hyp
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OpenStudy (joannablackwelder):
Any thoughts from here?
OpenStudy (shaleiah):
I plugged the formula in and I got 40... Do I need to put it in radical form?
OpenStudy (shaleiah):
\[40=2\sqrt{10}\]
OpenStudy (joannablackwelder):
That would be a good idea, however, I don't get 40. How did you get that?
OpenStudy (z4k4r1y4):
im afraid it's the formula I put up
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OpenStudy (joannablackwelder):
cos(30)/20sqrt(3)
This one?
OpenStudy (z4k4r1y4):
\[x=\frac{ \cos 30 }{ 20\sqrt{3} }\]
that's the right one
OpenStudy (z4k4r1y4):
the previouse one was wrong
OpenStudy (shaleiah):
Alright.. I entered it correctly this time. I got 0.025
OpenStudy (z4k4r1y4):
yh that's right
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OpenStudy (joannablackwelder):
No, the cos formula is:|dw:1452035143546:dw|
OpenStudy (joannablackwelder):
|dw:1452035180645:dw|