To find an expression equivalent to \( 6^{-2} \), we can use the property of exponents that states \( a^{-n} = \frac{1}{a^n} \).
Using this property:
\[ 6^{-2} = \frac{1}{6^2} \]
Calculating \( 6^2 \):
\[ 6^2 = 36 \]
Thus,
\[ 6^{-2} = \frac{1}{36} \]
So the equivalent expression to \( 6^{-2} \) is:
\[ \frac{1}{36} \]
Therefore, the correct response is:
\(\frac{1}{36}\).