exam Maths Puzzle Numerical Ability

i dont know how to solve any of these problems..i really need help..i cant fail math..please help i have a 5 grade test

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exam Other Question

Given three successive 1:100 dilutions (into bottles A, B, C) from a culture sample cotaining 120,000,000 organisms pere milliliter, calculate the number of organisms per millilite Hello, I am in deep need of help. I am suppose to use the sqrt property to solve equation.
(a-2)^2=8
Thanks for anyone that can help.