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Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the

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