book Maths Puzzle Numerical Ability

okay i dont know how to do the whole typy in htingy but it says
"the square root of x+2 = the square root of 3x-6 so is it 4?

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book Other Question

i know this forum is for albebra but i was hoping someone could possibly help me with a statistics problem.

in hypothesis testing when you have n>30 ex: n=36>30, how do you get
simplify reduce
sqrt of 54x^8