If f is a function defined for all k by f(k) = k^3 /16, what is f(2 k) in terms of f(k)?
Choose the correct option:
A) 1/8 f(k)
B) 8 f(k)
C) 2 f(k)
D) 10 f(k)
E) 32 f(k)
f(k) = k^3 /16   f(2k) = (2k)^3 /16 =8 * k^3/16 = 8 x (k^3 /16) = 8 f(k).   So answer is 8 f(k).
<result>B</result>
If f is a function defined for all k by f(k) = k^3 /16, what is f(2 k) in terms of f(k)?