The formula for the future value of an annuity due involves the expression (1 + p)"+1-1 - 1.
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Write this expression over a common denominator and factor the numerator to simplify,

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