- Probablity and statistics review help? Can anybody help me PLEASE?

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2x+3y=13 with 2x+5y=7? Find the percent anhydrate in CaSO4 - 2H2O. If 16g of the calcium sulfate hydrate are heated until all the water evaporates off, mass? How many grams of AuCl3 can be made from 250.0 grams of chlorine by this reaction: AU + Cl2 -> 2 AuCl3? Can i increase the output voltage of my transformer when the input voltage is low? Can someone please give an example of an energy transformation in which kinetic energy is converted to work?