exam Maths Puzzle Numerical Ability

Suppose f(x)=3x^2-4x+5. Explain how f(9) differs from f(x)=9.

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exam Other Question

A car that sold for $15,200 had a sales tax of $912. At the same rate, how much is the tax on a car that sells for $12,000? Numerator: (6/h+3)-2

Denominator: h