exam Maths Puzzle Numerical Ability

Given the coordinate of one endpoint af AB and its midpoint M, find the coordinates of the other endpoint.

B(-5,1), M(1,-1)

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exam Other Question

Rewrite the expression x^3-2x^2y+xy^2 so that it is easy to calculate the its value without a calculator when x=21 and y=19. find two integers whose difference is 23 and whose product is 195