Answer
$$ - \frac{3}{6} - \frac{{3\sqrt 3 }}{2}i$$
Work Step by Step
$$\eqalign{
& \frac{{16\operatorname{cis} {{310}^ \circ }}}{{8\operatorname{cis} {{70}^ \circ }}} \cr
& {\text{Using the Quotient Theorem}} \cr
& = \frac{{16}}{8}\operatorname{cis} \left( {{{310}^ \circ } - {{70}^ \circ }} \right) \cr
& = 3\operatorname{cis} \left( {{{240}^ \circ }} \right) \cr
& = 3\left( {\cos {{240}^ \circ } + i\sin {{240}^ \circ }} \right) \cr
& {\text{Write in Rectangular form}} \cr
& = 3\left( { - \frac{1}{2} - \frac{{\sqrt 3 }}{2}i} \right) \cr
& = - \frac{3}{6} - \frac{{3\sqrt 3 }}{2}i \cr} $$
