Write the coefficient of $x^2$ in the following polynomial.

$\sqrt{3}x+1$

Find the degree of the following polynomial.

$x^4+x^6+x^2+2^7$

Find the degree of the following polynomial.

$5x^3+2x^2+3x$

Find the degree of the following polynomial.

$3-y^2$

Find the degree of the following polynomial.

$2x-7$

Find the degree of the following polynomial.

$3x^2-2x+1$

Find the degree of the following polynomial.

$x-6x^2+2+3x^4$

Find the degree of the following polynomial.

$x^5+{10}^6$

Find the degree of the following polynomial.

$\left(y+3\right)\left(y^3+y-2\right)$