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

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

$\displaystyle {10}{x}^{{4}}+\frac{{8}}{{x}^{{3}}}-{5}{x}^{{2}}+{8}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {13}{x}^{{5}}-{18}{x}^{{2}}+{4}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {10}{x}^{{8}}+{5}{x}^{{6}}-{8}{x}^{{3}}+{12}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {7}{x}^{{4}}+{6}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial