Please answer correctly !!!!! Will mark Brianliest !!!!!!!!!!!!!!

Answer:
[tex]10\sqrt{2}[/tex]
Step-by-step explanation:
[tex]\sin 45^{\circ}=\frac{y}{10\sqrt{2}},\\y=10\sqrt{2}\sin45^{\circ}=10\sqrt{2}\cdot\frac{\sqrt{2}}{2}=\frac{10\cdot 2}{2}=\boxed{10}[/tex]