Express the following with a positive index:
$p^{-2}$p−2
Express the following with a positive index:
$a^{-9}$a−9
Express the following with a positive index:
$\frac{1}{a^{-n}}$1a−n.
Write $\frac{a^{-n}}{b^{-m}}$a−nb−m without negative exponents.