exam Maths Puzzle Numerical Ability

solve for y:

9y^4 - 4y^2 = 0

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exam Other Question

The difference between two positive integers is 42. One integer is three times as great as the other. Find the integers. A water wheel has a 10ft radius. To get a good approximation of the speed of the river, you count the revolutions of the wheel and find that it makes 14 revolutions per minute (rpm). What is the speed of the river?