Answer
$-30z^{11}$
Work Step by Step
We are given the expression $-3z^{4}\times10z^{7}$. First, we can group like terms.
$(-3\times10)\times(z^{4}\times z^{7})$
Next, we can use the product rule, which holds that $a^{m}\times{a^{n}}=a^{m+n}$ (where a is a real number, and m and n are positive integers).
$-30\times(z^{4+7})=-30z^{11}$
