exam Maths Puzzle Numerical Ability

factoring a quadratic with leading coefficient greater than one
y^2-10-39

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exam Other Question

What pedaling speed in rotations er minute must a racer maintain to make the rear wheel turn at 150 revolutions per minute? Simplify and evaluate:
(4^2x^3y^(-2)z^(-3)/x^(-5)y^8z^(-9))2