For expressions below that are polynomials, state whether it is a monomial, a binomial, a trinomial, or another polynomial. Otherwise, select "Not a polynomial".

$\displaystyle {3}{x}^{{8}}+{11}{x}^{{4}}-{20}{x}^{{3}}+{9}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {9}{x}^{{7}}+{6}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {2}{x}^{{7}}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {7}{x}^{{6}}-{15}{x}^{{2}}+{12}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {3}{x}^{{4}}+\frac{{8}}{{x}^{{3}}}-{11}{x}^{{2}}+{20}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial