- How to solve 3x+2y-z+w=0 , x-y+4z+2w=25 , -2x+y+2z-w=2 , and x+y+z+w=6 using Gaussian Elimination?

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Predict the type of bond that would be formed between each of the following pairs of atoms: 1. O and F 2. H and H 3. Mg and I? On a multiple choice test, are you more likely to get questions right by choosing the same answer for the whole thing, or blindly guessing? What mass of PCl5 will be produced with the given masses of both reactants? 30 g of PCl5 and 50 g of Cl2? How to find the frequency of the fundamental of a 1.5 meter long string that weighs 3.3 grams that has a tension of 86N? Can you guys help me ? I don't know how to factor this equation so I can get (a+1)^(n+1) - 1?