$85 \times 75=\ldots \ldots \ldots$

Write the degree of each of the following polynomials

$x^{8}-6561$

Classify the following as a constant, linear,quadratic and cubic polynomials:

$y^{3}-y$

Classify the following polynomials as polynomials in one variable, two variables etc.

$x^{2}+x+1$

Without actually calculating the cubes, find the value of each of the following

$\left(\frac{1}{2}\right)^{3}+\left(\frac{1}{3}\right)^{3}-\left(\frac{5}{6}\right)^{3}$