27. Simplify the following expression \( 3^{-3} \)

To simplify \( 3^{-3} \), you can use the rule that states \( a^{-n} = \frac{1}{a^n} \). Therefore, \( 3^{-3} = \frac{1}{3^3} \). Now calculate \( 3^3 \), which is \( 3 \times 3 \times 3 = 27 \). So, \( 3^{-3} = \frac{1}{27} \). Hence, the simplified form of the expression \( 3^{-3} \) is \( \frac{1}{27} \).