exam Maths Puzzle Numerical Ability

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)

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exam Other Question

evaluate each expression.

This is the problem I need help with: ((( 5(a - b) for a= -1/2 and b= -2/3)))
Simplify the following, assume a,x and y are not zero.
-x^2y/ (-x^2)^2y^2
I totally didnt understand this problem.