Answer:
B) 17
Step-by-step explanation:
A + B = 23
A - B = 7
B = A - 7
A + (A - 7) = 23
2A = 23 + 7
2A = 30
A = 15
15 - B = 7
B = 8
√(15² + 8²) = √289 = 17
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