Question

Simplify 3^-9 / 3^-12. 1/3^3 1/3^21 3^3 3^21

Answer 1

Here's a rule that applies to this expression:

1. Dividing exponents of the same base: $\frac{x^m}{x^n}=x^{m-n}$

For this, just divide:

$\frac{3^{-9}}{3^{-12}}=3^{-9-(-12)}=3^3$

Your answer is 3^3, or the third option.