exam Maths Puzzle Numerical Ability

I need help with the following

Given U = {18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29}, A = {21, 23, 25, 27, 29}, and B = {26, 27, 28, 29}. Find A′ U B′.

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exam Other Question

If f(x) = 11x + 7 and g(x) = x^2 - 6x, find (f o g)(x)
A common mistake when solving equations is the following:
The equation: 2(x - 2) = x + 3
First step in solving: 2x - 2 = x + 3
Write a clear explanation of what error has been made. What could be done to avoid this error?