exam Maths Puzzle Numerical Ability

how do i write interval notations for the solution set and graph the solution

2x < -1 or x + 3 > 0

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exam Other Question
Show that the points D(-1,-2),E(2,1) and F(-3,6) are the vertices of a right triangle. how do you solve y=1/2(x-3)^2-5 ????????