book Maths Puzzle Numerical Ability

Please explain and factor the polynomial:
n^2/4 - 9/16

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book Other Question

The nut house sells walnuts for $4 a pound and cashew for $7 a pound. how many pounds of cashews shound be mixed with 10 pounds of walnuts to obtain a mixture htat sells for $5.5 a pound? 3x-2=7