exam Maths Puzzle Numerical Ability

Hi, my teacher has asked us to determine whether the sqrt of - is rational or irrational. How are we supposed to determine that:? Thanks for your help.

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exam Other Question
Compute the inverse of the transformation f(x,y,z) = (x + 2y -z, x -2y -z, x + 6y + z). Find the perimeter or circumference, and the area of a square with side 2 ft. 3 in.