Plz answer asap 20 points
what is the common difference, d, of the sequence?
9, -8, -25, -42, -59,
enter your answer in the box.

d=

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Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

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