Algebra-2

Question Analysis
This problem assesses the ability to use the cosine function to find the length of a side in a right triangle.

Key Concept Explanation
The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse. Given the cosine value and the hypotenuse, we can find the length of the adjacent side.

Step-by-step Solution
1. Use the given cosine value:
2. Set up the equation:

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