- What does grounding mean for electricity?

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In dimensions, If a measurement is 5.25x5.5 would 5.25 be the width or the height? A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4? Find the directional derivative of f(x,y) = x/y at the point (2, -4)? In an arithmetic sequence t4=6 and 3t2=t10. find the value of a and the value of d? Can you get liquid mercury from a fluorescent lightbulb containing mercury?