To find the numerical equivalent of \( 4^9 \cdot 4^{-7} \), we can use the property of exponents that states \( a^m \cdot a^n = a^{m+n} \).
So, we can add the exponents:
\[ 4^9 \cdot 4^{-7} = 4^{9 + (-7)} = 4^{9 - 7} = 4^2 \]
Now, we calculate \( 4^2 \):
\[ 4^2 = 16 \]
Therefore, the numerical equivalent of \( 4^9 \cdot 4^{-7} \) is \( 16 \).
The correct response is: 16.