Answer:
14/5
Step-by-step explanation:
[tex]\frac{4* \frac{1}{2}}{1*\frac{5}{7}}\\\\\frac{2}{1} / \frac{5}{7} = \frac{2}{1} * \frac{7}{5} = \frac{2*7}{5} = \frac{14}{5}[/tex]