Answer:
C
Step-by-step explanation:
Midpoint is like average, so 0+20 (the x-coordinates) = 20, then divide it by 2 to get the midpoint.
I hope this helped, and please mark this as brainliest!
B & C
midpoint of 20 and 0 is 10. 10 can be counted by hand. 20/2=10
