81 is the correct answer
hope it helps you have a good day
Answer:
Step-by-step explanation:


Answer:
in confused on what the question is asking is it multiple questions
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Answer: 5
Step-by-step explanation:
use formula a^2 + b^2 = c^2
a^2 + 12^2 = 13^2
a^2 + 144 = 169
- 144 -144
a^2 = 25
sqrt sqrt
a = sqrt (25)
a = 5