Simplify each expression, but don’t evaluate.
${\left(4^{15}\right)}^3$

Simplify the expression with NO negative exponents.

$2^{-1}+4^{-1}$

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.

${\left({100}^{26}\right)}^0$

Simplify each expression, but don’t evaluate.

$\frac{(x^2{)}^4}{{\left(x^3\right)}^3}$

Simplify each expression using the product rule if possible.

${12}^3\cdot {12}^9$

Simplify each expression using the product rule if possible.

$(-4{)}^6(-4)$