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Find the value of x to the nearest tenth.

a. 8.6

b. 5.7

c. 26.3

d. 9

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.

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.

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