What is the gcf of 27,45,and 63

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Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

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