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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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Cos^2x+cos^2(120Β°+x)+cos^2(120Β°-x)i need this asap. pls me
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