Answer:
B.) 3√15
Explanation:
a^2 + b^2 = c^2
x^2 + 11^2 = 16^2
x^2 + 121 = 256
x^2 = 256 - 121
x^2 = 135
√x^2 = √135
√135 = √9 • √15
√9 = 3
√15 = √15
3√15
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