If f is the function defined for all k by f(k) = ~$\frac{k^{5}}{16}$~ , what is f(2k) in terms of f(k)?
~$\frac{1}{8}$~f(k)
~$\frac{5}{8}$~f(k)
2 f(k)
10 f(k)
32 f(k)
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