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10y62+9Y+2 FACTORING POLYNOMIALS HAVING TROUBLE WITH HOMEWORK THANKS

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Suppose that a certain radioactive substance has a half-life of 20 years. If there are presently 2500 milligrams of the substance, how much, to the nearest milligram, will remain after 50 years? ..What is the total length of 32 pieces of copper wire, if each piece is 2 3/16 inches long?

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