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Me find the value of x each figure.

Given right triangle a w/a hypotenuse length of x+4 and a leg of x, and right triangle b, w/ a hypotense length of 3y and a leg length of y+4 for what values of x and y are the triangles congruent by hl?

What is the absolute value of the complex number -4- 2 v14 3.15 14 18