To convert the expression \( 14^{-7} \cdot 9^{13} \) into an equivalent expression with only positive exponents, we can apply the Property of Negative Integer Exponents. The property states that \( a^{-n} = \frac{1}{a^n} \).
Using this property, we can rewrite \( 14^{-7} \) as:
\[ 14^{-7} = \frac{1}{14^7} \]
So, the expression \( 14^{-7} \cdot 9^{13} \) can be rewritten as:
\[ \frac{1}{14^7} \cdot 9^{13} = \frac{9^{13}}{14^7} \]
Thus, the equivalent expression with only positive exponents is:
\[ \frac{9^{13}}{14^7} \]
Looking at the provided responses, the equivalent expression is:
\[ \text{Start Fraction } 9^{13} \text{ over } 14^{7} \text{ End Fraction} \]
So, the correct answer is:
\[ \frac{9^{13}}{14^{7}} \]