Check whether the following polynomial is monic or not.

$1+2x+3x^2-x^3$

Check whether the following polynomial is monic or not.

$\sqrt{3}{x}^4+\sqrt{5}{x}^2+\sqrt{7}$

Check whether the following polynomial is monic or not.

$\left(y-3\right)\left(y^2+y+1\right)$

Check whether the following polynomial is monic or not.

$2+\frac{1}{3}x+\frac{2}{5}{x}^2$

Check whether the following polynomial is monic or not.

$1$

Classify the following polynomial as linear, quadratic, cubic and biquadratic polynomial.

$x-x^2$

Classify the following polynomial as linear, quadratic, cubic and biquadratic polynomial.

$7x^3$

Classify the following polynomial as linear, quadratic, cubic and biquadratic polynomial.

$t+t^2-3$

Classify the following polynomial as linear, quadratic, cubic and biquadratic polynomial.

$2+3x$