book Maths Puzzle Numerical Ability

why square roots can have two answers or one or none?

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Here are 3 questions that I am stuck on can you help? Thanks

Explain in your own words how to reverse FOIL when factoring a polynomial of the form ax + bx +c when a =1. Give an
In a group of quarters and nickles, there are 4 more nickles than quarters.
How many nickles and quarters are there if the coins are worth $2.30?