To use the Power Rule of Exponents correctly, we need to understand that \((a^m)^n = a^{m \cdot n}\).
In the expression \((10^9)^7\), we would apply the Power Rule as follows:
\[ (10^9)^7 = 10^{9 \cdot 7} = 10^{63} \]
Therefore, the correct response that uses the Power Rule of Exponents in the expression \((10^9)^7\) is:
10 superscript 63 baseline