[tex]\it a) \sqrt{50}:\sqrt5=\sqrt{50:5}=\sqrt{10}\\ \\ b)\ \sqrt{15}:(-\sqrt3)=-\sqrt{15:3}=-\sqrt5\\ \\ c)\ -\sqrt{35}:(-\sqrt7)=+\sqrt{35:7}=\sqrt5\\ \\ d)\ 4\sqrt{21}:\sqrt7=4\sqrt{21:7}=4\sqrt3\\ \\ f)\ (16)\sqrt{42}:(-8\sqrt7)=-(16:8)\sqrt{42:7}=-2\sqrt{6}[/tex]
