Answer:
SUPER EASY!
So using the 30, 60, 90 triangle theorem and the sum of all angles in a triangle(180 degrees of the sum of all the angles):
m<BCA=30(degrees)
So, the side opposite is to the 30 degree angle in the 30, 60, 90 triangle is half the hypotenuse(the side opposite to 90 degrees).
So:

So, x is 28 units
Hope this helps!
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