To rewrite \( 3^{-4} \) using a positive exponent, you can use the property of exponents that states \( a^{-n} = \frac{1}{a^n} \).
So,
\[ 3^{-4} = \frac{1}{3^4} \]
Thus, \( 3^{-4} \) can be rewritten as \( \frac{1}{3^4} \) with a positive exponent.