Write the degree of each of the following polynomials

$8 x^{5}+3 x^{2}-4 x+7$

On dividing $p(x)=2 x^{3}-3 x^{2}+a x-3 a+9$ by $(x+1),$ if the remainder is $16,$ then find the value of $a$. Then, find the remainder on dividing $p(x)$ by $x+2$

Evaluate the following products without multiplying directly

$88 \times 86$

Classify the following polynomials as polynomials in one variable, two variables etc.

$x y+y z+z x$

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