Correct. Divide each term in the polynomial by the monomial. The question marks stand for 4.

$\displaystyle\frac{{{9}{{z}}^{{7}}+{15}{{z}}^{{5}}-{12}{z}}}{{{3}{{z}}^{{3}}}}=\frac{{{9}{{z}}^{{7}}}}{{{3}{{z}}^{{3}}}}+\frac{{{15}{{z}}^{{5}}}}{{{3}{{z}}^{{3}}}}-\frac{{{12}{z}}}{{{3}{{z}}^{{3}}}}={3}{{z}}^{{4}}+{5}{{z}}^{{2}}-\frac{{{4}}}{{{{z}}^{{2}}}}\usepackage{cmbright}\Huge\$