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Write the expression 7x^3-28xy^2 as the product of 3 factors

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

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2