The problem asks to rewrite the expression $9a^{-4/9}$ using positive exponents.

1. Problem Description

The problem asks to rewrite the expression $9a^{-4/9}$ using positive exponents.

2. Solution Steps

We have the expression $9a^{-4/9}$. To express this with positive exponents, we need to move the term with the negative exponent to the denominator. Recall that $x^{-n} = \frac{1}{x^n}$.

Therefore, we have

$9a^{-4/9} = 9 \cdot a^{-4/9} = 9 \cdot \frac{1}{a^{4/9}} = \frac{9}{a^{4/9}}$.

3. Final Answer

The expression $9a^{-4/9}$ with positive exponents is $\frac{9}{a^{4/9}}$.