- The substance tgat is formed in a chemical reaction is called the?

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Find the standard deviation of X=(Y+Z)/2, where Y and Z are the two outcomes of rolling a pair of dice.
Two ways, to get the answer? Determine the mass of zinc and mass of copper in a 100g sample of brass.
Density of Zinc: 7140kg/m^3
Density of Copper 8920kg/m^3? What does bernoulli's principle have to do with flight and sailing? Is there any website to download a textbook FOR FREE? I need Geography: The Human and Physical World by Mc Graw Hill.I have a test on Monday? So what does 1to 15 means?