exam Maths Puzzle Numerical Ability

y=-3/2x

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please help me with these problems:

what is the square roots of 128 and 80? Perform the indicated operations.
Let U = {a,b,c,d,e,f,g}, X = {a,c,e,g}, Y = {a,b,c} and Z = {b,c,d,e,f}

1. X'n Z

2. (X' U Y')UZ

3. (X n Y')n(Y n X')