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At a store, 2 gallons of milk cost $6. Which is the value of the ratio of dollars to gallons of milk? How do you find the length from the vertex of a regular tetrahedron to the center point of its opposite face? Mei du yi? How many grams of AuCl3 can be made from 250.0 grams of chlorine by this reaction: AU + Cl2 -> 2 AuCl3? A fair coin is tossed 5 times. What is the probability of at least one head? Round to the nearest ten-thousandth.?