exam Maths Puzzle Numerical Ability

Factor completely:
36x2 � 4y2

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exam Other Question

Sorry about the other ?, that was an incomplete eqaution.

(4xy)(5x) suppose that the indes of refraction v1/v2 of light in passing from one medium into another is 1.89, and that the angle of incidence is theta1=64(degrees). using Snell's law,