kevooooooo7819 kevooooooo7819 11-03-2024 Mathematics contestada Find the average of x, y across the surface of a triangle with vertices (-1,1,1), (1,-1,1), and (1,1,-1). A) (0, 0) B) (1/3, 1/3) C) (1, 1) D) (2, 2)