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Answer:The coordinates of point B is (8,-4)Step-by-step explanation:Midpoint of a line segment: It is the point on the line segment that divides the segment in two congruent segments.Since it is given that C is the midpoint of Line segment AB.Mid-point of a segment of end pointsandis, C=.As, given the coordinates of A and C are (2,4) and (5,0)then, we have,;andto find the coordinates of.Simplify:⇒to solve forwe have,oror= -4so, the values ofandTherefore, the coordinates of point B is (8,-4)...