exam Maths Puzzle Numerical Ability

A half is a third of it. What is it?

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Hi! Could someone please help me with these problems. I need to simplify and all exponents should be positive.

(x+4)^2

(x+5y)(x-5y)

(x^3+7x^2+7x-15)/(x+3)

Thanks so much for your help! the sum of the square of 2 consecutive odd positive integers is 209. find the integers.