Antonio just signed up for new phone plan and is comparing his fees to that of his friend Marcus. T hey create equations so that they could compare their fees with each other. Antonio's plan: Monthly cost = 3(.75m+10)+2.50m-15 where m is the number of minutes used Marcus's Plan: Monthly cost = 2(1.75m+12.50)-.75m+4 where m is the number of minutes used %3D (a) By setting their monthly cost equal, decide after how many minutes the two plans will cost the same. (b) Antonio compares his plan to another friend, Brielle's. Given that both Antonio and Brielle will only be charged for full minutes, is there an amount of time when their two plans cost the same? Explain. Brielle's plan: Monthly cost = 2(1.50m+12)+m-4 where m is the number of minutes used %3D

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