To rewrite \( \sqrt[3]{82} \) using an exponent, we can express it in terms of fractional exponents:
\[ \sqrt[3]{82} = 82^{1/3} \]
Now, we can simplify the expression \( 82^{1/3} \).
Thus, the rational number that could be used as an exponent is \( \frac{1}{3} \).
So, to summarize:
- The rational number that could be used as an exponent is \( \frac{1}{3} \).
- The simplified expression is \( 82^{1/3} \).