We need to find the side that uses the adjacent and hypotenuse ratio. Using SOHCAHTOA:
Cosine is the ratio between adjacent and hypotenuse. Since x is adjacent to 49 and 14 is the hypotenuse, we can solve for x.

First, multiply both sides by 14.

Next, we need to simplify the left side of our equation. We will do this using a calculator.

This leads to choice C, 9.2, being the correct answer.