Simplify the expression with NO negative exponents.
$2^{-1}+4^{-1}$

Rewrite the expression with NO negative exponents.

$y^{-8}$

Rewrite the expression with NO negative exponents.

$\frac{1}{5^{-3}}$

Simplify the expression with NO negative exponents.

$-6^{-2}$

Simplify the expression with NO negative exponents.

$9z^{-6}$

Simplify the expression with NO negative exponents.

$2^{-1}\cdot 2^4$

Simplify the expression with NO negative exponents.

$a^3\cdot a^{-7}\cdot a^5$

Simplify the expression with NO negative exponents.

$\frac{3^{-4}}{5^{-2}}$

Simplify each expression, but don’t evaluate.

${\left(4^{15}\right)}^3$