Answer:
[tex]\tt\cfrac{\sqrt{14}}{6}[/tex]
Step-by-step explanation:
[tex]\tt\sqrt{\cfrac{7}{18}}= \cfrac{\sqrt{7}}{\sqrt{18}}=\cfrac{\sqrt{7}}{3\sqrt{2}}=\cfrac{\sqrt{7}\cdot\sqrt{2}}{3\sqrt{2}\cdot\sqrt{2}}=\cfrac{\sqrt{7\cdot2}}{3\cdot2} =\cfrac{\sqrt{14}}{6}[/tex]
