To simplify the expression \( \frac{7^3}{25^{-4}} \) using the Property of Negative Integer Exponents, we can use the property that states \( a^{-n} = \frac{1}{a^n} \).
Starting with the original expression:
\[ \frac{7^3}{25^{-4}} \]
Since \( 25^{-4} \) can be rewritten as \( \frac{1}{25^4} \), we have:
\[ \frac{7^3}{25^{-4}} = 7^3 \cdot 25^4 \]
Thus, the equivalent expression with only positive exponents is:
\[ 7^3 \cdot 25^4 \]
So, the final answer is:
\[ 7^3 \cdot 25^4 \]