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Mathematics 19 Online
OpenStudy (shaleiah):

Medal For helping me solve this question. --Click to view--

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,

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

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

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

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

OpenStudy (joannablackwelder):

No, the cos formula is:|dw:1452035143546:dw|

OpenStudy (joannablackwelder):

|dw:1452035180645:dw|

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