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0=-x^2 + .21x + 50? How many 1st and 2nd and 3rd order streams are shown in this dairgram? I've counted 10 1st. I need help finding the 2md and 3nd.? Which would draw more millionaire tourists, a hotel in earth orbit or a resort on the moon? What is a gallon in metric conversion? Assume that a single cylinder of an automobile engine has a volume of 524?