$4 x^{2}+11 x-3$ is a $\ldots \ldots$ polynomial.

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

If $p(x) = x^2 - 4x + 3$,evaluate: $p(2) - p(-1) + p\left(\frac{1}{2}\right)$

Find the degree of the polynomial given: $2 - y^{2} - y^{3} + 2y^{8}$

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: $\sqrt{3} x^{2}+\pi x-9$

Write the degree of the following polynomial: $5x^{2} + 12x + 4$.