book Maths Puzzle Numerical Ability

Question
1)p3+27
2)m2-2m-15
3)(0.9x+0.7y)
4)x2-6x+8
5)(x+3y)3

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book Other Question

2-5x=6-3x A car moving at 50km/h skids 15m with locked brakes. How far will the car skid with locked brakes at 150km/h?