The Property of Negative Integer Exponents states that \( a^{-n} = \frac{1}{a^n} \) for any non-zero base \( a \) and positive integer \( n \).
For \( 15^{-38} \), you can apply this property as follows:
\[ 15^{-38} = \frac{1}{15^{38}} \]
So, \( 15^{-38} \) can be rewritten as \( \frac{1}{15^{38}} \).