Find the value of x to the nearest tenth.

Mathematics
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Find the value of x to the nearest tenth.

a.  8.6

b.  5.7

c.  26.3

d.  9

May 5th, 2015

Cosine (theta) = (Adjacent)/(hypotenuse)

cos 39 = 7/x

x cos 39 = 7

x = 7/cos 39

x = 7/0.2667

x = 26.29

Therefore, the answer is C.

May 5th, 2015

Here are the general rules:

1. sine (theta) = Opposite / Hypotenuse

2. Cosine (theta) = Adjacent / Hypotenuse

3. Tangent (theta) = Opposite / Adjacent

You can use the phrase SOHCAHTOA to master the above rules. 

May 5th, 2015

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