Mathematics, 19.12.2019 05:31, patworsley

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you are trying to decide which cell phone plan to purchase. plan a charges $40 for a new phone and $20 a month for usage. plan b provides the phone for free, but has a fee of $30 a month for usage.
use the substitution method to determine when the two plans will cost the same.

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you are trying to decide which cell phone plan to purchase. plan a charges $4...