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If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? 15.00g of Si reacts with 25.00g of F2 to produce 28.67g of SiF4. Which reactant is the limiting reagent? Can reality itself be programmed by interacting with it - in particular asking questions that lead to where you're directing it to go? How to locate/take pictures of planets? How many 2 cubic ft. bags of mulch to fill a space that is 30 ft. x 16 ft. x 3 in's deep?