exam Maths Puzzle Numerical Ability

I have this expression

square root of -144
which would be 12 12
break it out further it would be -3*4 and -3*4
so than it would be -4 square root 3?

These kind of problems play with your head. Is this correct?

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exam Other Question
How do you identify the smallest subset of the real numbers that contains any given number? How would you apply that for the number e? We don't have a textbook, so I can't refer evaluate each expression.

This is the problem I need help with: ((( 5(a - b) for a= -1/2 and b= -2/3)))