Answer:
x = 3√7.
y = 12.
Explanation:
The 2 triangles are similar so:
x/9 = 7/x
x^2 = 63
x = √63
= 3√7.
By Pythagoras' theorem
y^2 = 9^2 + (3√7)^2
= 81 + 63
= 144
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