PLEASE I NEED SO MUCH HELP HERE!!!!!!
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You have to use the Geometric Mean for triangles to find x. Our form will look like this: 
which simplifies to 
. Cross multiply to get 
. Therfore, x = 4. Usually when we take the square root of a number we will end up with both the principle (positive) root and the negative one as well. But since the 2 things in math that will never EVER be negative are time and distance/length, we will not consider the -4. x = 4