exam Maths Puzzle Numerical Ability

Please help.
Solve 2/5x=-10

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exam Other Question

1)
Floor plans for a building have the four corners of a room located at the points (2,3), (11,6), (-3,18), and (8,21). Determine whether the side through the points (2,3) and (1
Divide:
x2 – 3x + 2 ÷ x2 – 4
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8x – 8 5x + 10