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