exam Maths Puzzle Numerical Ability

Show that the points D(-1,-2),E(2,1) and F(-3,6) are the vertices of a right triangle.

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exam Other Question

William shared his baseball card collection with his friends. He gave 25% to Tom, 1/6 to Hal, and .05 to Joe. If William originally had 60 cards in his collection, how many cards did he have left after sharing with his 3 friends? how do i write interval notations for the solution set and graph the solution

2x < -1 or x + 3 > 0