book Maths Puzzle Numerical Ability

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

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book Other Question

A movie theater sells adult tickets at $5.50 a ticket and $3.50 for a childs ticket. How many of each ticket was sold if 21 tickets were bought for $83.50 A cube has a surface area of 194.94 square inches. How many inches long is one of its edges?