Answer:
I think its B
Step-by-step explanation:
In order to obtain the midpoint we usually add the coordinates of the two points then divide it by two.
M=(R+S)÷2
(6,9)=((2,5)+(S))÷2
multiply each side by two to open the brackets
(12,18)=(2,5)+(S)
S=(12,18)-(2,5)
S=(10,13)
