exam Maths Puzzle Numerical Ability

Find the GCF.

(6y squared - 3y)(y + 7)

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2) The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r is the radius of the cylinder and h is the height of the cylinder. Suppose the volu In studying the frictional effects on a flywheel, the revolutions per minute R that it makes as a function of the time t (in min) is given by R = 4520(0.750)^2.50t. Find t for R = 1950 r/min