Classifying Polynomials

Describe the expression $$2x^2+3x$$   by its number of terms.

Describe the expression $$5y^3+4y$$   by its number of terms.

Describe the expression $$x^3y^3-3x^2y+3xy^2-y^3$$   by its number of terms.

Describe the expression $$8m^3-12m^2n+6mn^2-n^3$$   by its number of terms.

Describe the expression $$3x^4-xy+5$$   by its number of terms.

Describe the expression $$5x^3-xy+2$$   by its number of terms.

Describe the expression $$x^{-2}+5x^{-1}+4$$   by its number of terms.

Describe the expression $$\frac{1}{2x^2-5x}$$   by its number of terms.

Describe the expression $$\frac{2y^3z}{5}+\frac{9y^5z^2}{10}-\frac{8y^7z^2}{3}$$   by its number of terms.

Describe the expression $$\frac{1}{6}n+\frac{1}{2}n^3+\frac{1}{3}n^2$$   by its number of terms.