exam Maths Puzzle Numerical Ability

Given line segment AB with midpoint M(5,-1) and endpoint B(8,2), what are the coordinates of A?

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exam Other Question

4(x-3)=-24;-3 Evaluate 2 ` (2 - 3)3 + 6 ÷ 3 + (8 - 5)2

How do I do this? please explain, thank you.