- What's the easiest way to do percentages in your head?

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First derivative of, 10x(2-lnx)? A pipe delivers 239 gallons of water a minute. If the velocity of the water is 27 ft/s what is the diameter of the pipe? Complete combustion of 8.70 g of a hydrocarbon produced 26.7 g of CO2 and 12.7 g of H2O. What is the empirical formula for the hydrocarbon? Which quadrilateral has 4 congruentsides and 4 congruent angles? Find the volume of the solid obtained by rotating the region bounded by the curves: y=3x, y=6sqrtx; about y=12?