- What does the "A" mean in the periodic table group names? Help?

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If I am afraid of big earthquakes happening should just stay New England or move to California? Find a polar equation for the curve represented by the given Cartesian equation.
xy = 2? The difference between the squares of 2 numbers is 77. 4 times the square of the 1st number increased by the square of the 2nd number is 73.? How many grams do 5.5x10 20 atoms of lithium weight? Answer in unit of g.? Any helpful calculus resources?

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