To apply the Power Rule of Exponents, which states that \((a^m)^n = a^{m \cdot n}\), we can simplify the expression \((15^6)^2\).
Using the rule:
\[ (15^6)^2 = 15^{6 \cdot 2} = 15^{12} \]
Thus, the equivalent expression is \(15^{12}\).
The correct response is:
15^12