Answer:
A. x = 5
Explanation:
This triangle is a right triangle, so we can use the Pythagorean theorem.
a^2 + b^2 = c^2
3^2 + 4^2 = x^2
9 + 16 = x^2
25 = x^2
x^2 = 25
x = sqrt(25)
x = 5
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