Evaluate: $3^{-3}=$
A. -27
B. -9
C. $\frac{1}{9}$
D. $\frac{1}{27}$
\( \frac{1}{3 \times 3 \times 3} = \boxed{\frac{1}{27}} \)
Step 1 :\( 3^{-3} = \frac{1}{3^3} \)
Step 2 :\( \frac{1}{3^3} = \frac{1}{3 \times 3 \times 3} \)
Step 3 :\( \frac{1}{3 \times 3 \times 3} = \boxed{\frac{1}{27}} \)