- Math Problem pls help... E = mc^2?

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How do you simplify 3√24x^5? How to calculate snow load in netherlands base on euro codes for steel design? Calculate the standard score of the given X value, X = 90.2 where µ = 88.3 and σ = 90 and indicate on the curve where z will be located? I know the answer is 1/3, but I don't know how to get to it.? How do you do these problems? Simplify 3√24x^2 and add and simplify 4√3 -3√27 +√49?