book Maths Puzzle Numerical Ability

How do I simplify a radical expression? That includes the product property and the quotient properties.

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book Other Question

How can you prove that:

odd + odd = even
even + even = even (you initially put even + even = odd)
odd + even = odd

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Which of the following is the greatest common factor of the terms 48s^5 t^3 u^2 and 40s^3 tu^4^?