exam Maths Puzzle Numerical Ability

Determine any (global) maxima or minima of the function g(x)=x^2-x-20.

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exam Other Question

A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture? find circumference of circle 16cm