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Use sigma notation to represent the following series for 9 terms.
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Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of
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The equation y=x+17 and y=-x-17 represent...
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