Classify the following as a constant,linear,quadratic,or cubic polynomial:
$2+x$

Without actually calculating the cubes,find the value of:
$(0.2)^{3} - (0.3)^{3} + (0.1)^{3}$

For the polynomial $\frac{x^{3}+2 x+1}{5}-\frac{7}{2} x^{2}-x^{6},$ write:
$(i)$ the degree of the polynomial
$(ii)$ the coefficient of $x^{3}$
$(iii)$ the coefficient of $x^{6}$
$(iv)$ the constant term

Write the degree of the following polynomial: $8x^{5} + 3x^{2} - 4x + 7$.

If $x+2$ is a factor of $x^{3}+ax^{2}-x+30$,find the value of $a$.

Expand $(11 x+18)(11 x-18)$.