Try the following ACT math practice question that tests your understanding of manipulating fractional exponential expressions.

If $x$ is a positive number, which of the following is equivalent to $x^{\frac{5}{2}}$ ?

- $x^2 \sqrt{x}$
- $x (\sqrt{x})^3$
- $\displaystyle \frac{x^3}{\sqrt{x}}$

- $\quad \textrm{I and II only}$
- $\quad \textrm{I and III only}$
- $\quad \textrm{II and III only}$
- $\quad \textrm{I, II, and III}$
- $\quad \textrm{None}$