Evaluate. Write your answer as a fraction in simplest form.

Answer:
[tex]\frac{27}{64}[/tex]
Step-by-step explanation:
[tex]\left( \frac{3}{4}^3 \right) = \frac{3^3}{4^3} = \frac{3\cdot 3\cdot 3}{4 \cdot 4 \cdot 4} = \frac{27}{64}[/tex]