exam Maths Puzzle Numerical Ability

evaluate each expression.

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

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exam Other Question

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?
Can you PLEASE help me figure these out. I am clueless!Thanks in advance!

Solve.
1) Square root of 3x-8 +4=6


2)Find the distance between (1,-3)and(4,3)