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How long does it take the earth to rotate once on its own axis? When given the equations x-y=-1, 2y-x=27, x+y =11 how would you use row echelon form to get to the answer (5,6)? What is the usual temperature at which most glassware are calibrated at? Convert 3.82x10^-23g to kg? Difference between tubular secretion and counter current exchange?