Answer to Question #5466 in Analytic Geometry for pau

Question

1.)Determine the vertices of a triangle whose sides have the mid-points (1,0), (2,-1), and (3,1).
2.)Two vertices of a triangle are (0,-6) and (4,0), and the medians intersect at (0,-2). find the third vertex of the triangle.
3.)If the area of a triangle with vertices (5,2),(x,4) and (0,-3) is 12/1/2, find x.
please help me with these questions. thank you