book Maths Puzzle Numerical Ability

how do you answer questions like x^2-4=2

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I need help on finding the probability of drawing a spade and then a club from a standard 52 card deck (without replacement) Maria has some money to invest. If she could invest 3000 more, she could qualify for an 11% investment. Otherwise, she could invest the money at 7.5% annual interest. If the 11% in