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

$\displaystyle {2}{x}^{{7}}+{5}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

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

$\displaystyle {16}{x}^{{5}}-{8}{x}^{{3}}+{15}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {3}{x}^{{8}}+{5}{x}^{{5}}-{17}{x}^{{2}}+{16}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial

$\displaystyle {3}{x}^{{4}}+\frac{{8}}{{x}^{{3}}}-{5}{x}^{{2}}+{17}$ is Select an answer a monomial a binomial a trinomial an other polynomial Not a polynomial