Answer and Step-by-step explanation:
For this triangle, to find x, we will use the cosine trigonometric function.
cosine functions look like this:

(The weird looking symbol is called theta, and represents an angle measurement)
Plug in the values into the equation.
cos(42) =

Multiply both sides by 15.
15(cos(42)) = x
Plug into a calculator.
11.1472 is the answer.
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