Answer:
B.) 20
Step-by-step explanation:
We know the midpoint of half of the segment, which is 5. You can use this to find the length of half, after which you can find the entire length by multiplying by 2:
[tex]RN+NS=RS\\5+5=10\\HR+RS=HS\\10+10=20[/tex]
The length of HS is 20.
