To simplify \((6^6)^3\) using the Power Rule of Exponents, you multiply the exponents. According to the rule:
\[ (a^m)^n = a^{m \cdot n} \]
In this case, \(a = 6\), \(m = 6\), and \(n = 3\). Thus, we have:
\[ (6^6)^3 = 6^{6 \cdot 3} = 6^{18} \]
So, the equivalent form of \((6^6)^3\) is \(6^{18}\).
The correct response is: 6 superscript 18 baseline.