Answer:
12
Explanation:
Pythag Theorem is Leg² + Leg²= Hypotenuse²
So I set it up as: x² + 9²=15²
Then solved and got: x² + 81 =225
Then I subtracted 81 on both sides and got: x² = 144
Then squareroot each side to undo the x² and got x=12
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