Classify the following as a constant,linear,quadratic,or cubic polynomial:
$3$

Determine the degree of the following polynomial:
$-10$

Find the value of the polynomial $p(x) = 5x^2 - 3x + 7$ at $x = 1$.

Which of the following expressions is a polynomial? State the reason. If an expression is a polynomial,state whether it is a polynomial in one variable or not: $\sqrt{3} x^{2}+\pi x-9$

Classify the following polynomial as a polynomial in one variable,two variables,etc.
$x^{2}+x+1$

Write the coefficient of $x^{2}$ in the following polynomial:
$\sqrt{5}x^{2} - 7x + 13$