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

$\displaystyle {2}{x}^{{8}}+{18}{x}^{{5}}-{15}{x}^{{3}}+{19}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {2}{x}^{{4}}+\frac{{8}}{{x}^{{3}}}-{18}{x}^{{2}}+{15}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

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

$\displaystyle {5}{x}^{{9}}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {16}{x}^{{6}}-{14}{x}^{{2}}+{18}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial