Answer:
18√(2y)
Step-by-step explanation:
The common factor √(2y) can be factored out, and its coefficients combined.
The root itself cannot be simplified in this case.
[tex]10\sqrt{2y}+5\sqrt{2y}+3\sqrt{2y}=(10+5+3)\sqrt{2y}=\boxed{18\sqrt{2y}}[/tex]