To rewrite the expression \((6^{-3})^5\) using a single exponent, you can use the power of a power property of exponents, which states that \((a^m)^n = a^{m \cdot n}\).
Applying this property to your expression:
\[ (6^{-3})^5 = 6^{-3 \cdot 5} = 6^{-15} \]
So the expression \( (6^{-3})^5 \) can be rewritten as:
\[ 6^{-15} \]