4. The Real Number System

Simplify each expression using the product rule if possible.

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

Simplify each expression using the product rule if possible.

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

Simplify each expression.

$xy\cdot 3x^2$

Simplify each expression.

$(-5a^2)\left(3a^8\right)$