exam Maths Puzzle Numerical Ability

This is a question from a worksheet - not a text book. Find the length of one side of the square when the hypotenuse is sqrt50. Thank you!

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exam Other Question

find three consecutive even integers such that the largest is three times the smallest. This problem has been bothering me for a while now. I need help on how to solve it. It goes like this: If f(x)= 1-3x and g(x)= 1/ x^2 +1, find f(g(0)) and g(f(1))