I will mark the brainliest
Answer options are in the image
A
B
C
D

Answer:
[tex] \frac{5 \sqrt{2} }{2}[/tex]
Step-by-step explanation:
[tex] \sin \: 45 \degree = \frac{x}{5} \\ \\ \frac{1}{ \sqrt{2} } = \frac{x}{5} \\ \\ x = \frac{5}{ \sqrt{2} } \\ \\ \huge \red{ \boxed{x = \frac{5 \sqrt{2} }{2} }}[/tex]