exam Maths Puzzle Numerical Ability

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,

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One invention saves 30 % on fuel; a second saves 45 percent; a third saves 25%. If you use all three inventions at once, how much fuel can you save Graph. y > x2+ 2.5

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