question_answer

By what number should \[{{\left( \frac{1}{8} \right)}^{-1/2}}\]be multiplied so that its product becomes \[{{\left( \frac{5}{7} \right)}^{-1/2}}\]?

A)  \[{{\left( \frac{7}{40} \right)}^{-1/2}}\]            

B)  \[\frac{\sqrt{7}}{2\sqrt{2}}\]

C)  \[\frac{\sqrt{70}}{20}\]

D)  \[\frac{\sqrt{70}}{40}\]

E)  None of these