To simplify \(64^{4/3}\), we can break it down as follows:
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Calculate the cube root of 64: \[ 64 = 4^3 \implies \sqrt[3]{64} = 4 \]
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Raise the result to the power of 4: \[ 4^4 = 256 \]
Therefore, the correct simplification of \(64^{4/3}\) is 256.
So the answer is: 256