exam Maths Puzzle Numerical Ability

Is sqrt x^2=x an identity (true for all values of x)?
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exam Other Question

A car is traveling on a road that is perpendicular to a railroad track. When the car is 30 meters from the crossing, the car’s new collision detector warns the driver that there is A 10 ft board is to be cut into two pieces so that the longer piece is 4 times shourter. Find the length of each piece.