book Maths Puzzle Numerical Ability

what is the square root of -4 equal to?

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book Other Question

explain how you would decide whether the product of three numbers is positive or negative I have 5 units out of 36 in compliance with a regulation. How do I figure out what percentage that is?

36 divided by 5 = 7.2%
5 x 100 divided by 36 = 13.8

Which is the corre