Question

Which of the following expressions is equivalent to the radical expression?

Answer 1

The correct answer is B) $m^{2/3}n^{5/3}$. 

The denominator of the exponent is the root we are taking.  The numerator is the exponent of the radicand.  This means 3 will be the denominator, since it is a cubed root, and 2 will be the numerator of m while 5 will be the numerator of n.