Write the coefficient of $x^{2}$ in the following polynomial:
$4+7x+3x^{2}$

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: $x^{2}+y^{2}+z^{2}+2xy+2yz+2zx$

Is the following expression a polynomial? Justify your answer:
$\frac{(x-2)(x-4)}{x}$

Degree of the polynomial $4 x^{4}+0 x^{3}+0 x^{5}+5 x+7$ is

Find $p(1)$,$p(2)$,and $p(4)$ for the polynomial $p(x) = x^3 + 9x^2 + 23x + 15$.

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