Algebra-2

Question Analysis
This problem tests the understanding of the cosine function and its application to find the length of the adjacent 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 solve for the adjacent side.

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

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