exam Maths Puzzle Numerical Ability

Determine whether the relation is a function.
(0,4),(1,4),(2,5),(3,6),(4,6)

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exam Other Question

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, Evaluate. (-1)(-1) - 25