6. Exponents, Polynomials, and Polynomial Functions

Simplify each expression using the product rule if possible.

$z\cdot z^6\cdot z^4$

Simplify each expression.

$xy\cdot 3x^2$

Simplify each expression.

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

Simplify each expression.

$\left(2s^{3}t\right)\left(3s^4{t}^2\right)$