Geometry

Question Analysis:
This is a coordinate geometry problem involving diagonals of a parallelogram.
The main focus is on using midpoint formulas and diagonal bisection.

Key Concept Explanation:
The diagonals of a parallelogram bisect each other, so the midpoint of both diagonals is the same.

Step-by-Step Solution:
Find midpoint M of RT:
M = ((2+8)/2, (3+7)/2) = (5, 5)
Let U be (x, y). Since diagonals bisect each other,
M = midpoint of SU = ((4+x)/2, (-1+y)/2) = (5, 5)
Solve:
(4+x)/2 = 5 → x = 6
(-1+y)/2 = 5 → y = 11
So U = (6, 11)

Option An...