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Answer:
(3.5, 4.5)
Step-by-step explanation:
That point will be the midpoint of either diagonal.
(A +C)/2 = ((-1, 3) +(8, 6))/2 = (-1+8, 3+6)/2 = (7, 9)/2 = (3.5, 4.5)
The center of the rhombus is (3.5, 4.5).
