9514 1404 393
Answer:
(b) √55
Explanation:
The right triangles in this geometry are all similar, so the ratio of long side to short side is the same:
y/5 = 11/y
y² = 55 . . . . . . multiply by 5y
y = √55 . . . . . take the square root
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And x=4√5 by looking at ratios of short side to hypotenuse.