book Maths Puzzle Numerical Ability

The revenune of a small concert promoter depends on the number of unsold concert seats. If 100 seats are sold, the price is $50. Each unsold seat increases the price per seat by $1

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How to evaluate e^ 2.53 to three decimals places? I'm not sure how to handle the radical in this quadriatic equation:

x^2 + x + sqrt(x^2 + x) - 2 = 0

In the provide examples, the duplicated x^2 + x can be substituted by some