exam Maths Puzzle Numerical Ability

Solve: x^4-3x^2-40=0

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exam Other Question

Find the number that is (1/3) of the way from 2(2/3) to 6(1/3). To work you drive 7.5 minutes in town at 24 mph, 15 minuties on the highway at 60 mph, and 12 minutes on a farm road at 45 mph. Express the total time you drive, f(d), as a piecewi