Which expression is equivalent to $3^2 \times 3^{-5}$?
$3^{7}$
$3^{-10}$
$3^{-3}$
$\frac{1}{3^{-3}}$
Which expression is equivalent to $(x^3)^2$?
$x^3$
$x^6$
$x^9$
$x^5$