Answer
11
Work Step by Step
As shown on page 445, we know that $a^{\frac{m}{n}}=\sqrt[n] a^{m}=(\sqrt[n] a)^{m}$.
Therefore, $121^{\frac{1}{2}}=\sqrt[2] 121^{1}=\sqrt 121=11$.
We know that $\sqrt 121=11$, because $11^{2}=121$.
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