Answer:
a = 12
Explanation:
Pythagorean Theorem: a^2 + b^2 = c^2
a^2 + 9^2 = 15^2 >> solve the exponent
a^2 + 81 = 225 >> subtract both sides by 81
a^2 = 144 >> square root
uhh i think its 5 ignore this wishsbsns
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