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Mathematics, 31.07.2019 12:10 econsta3

It costs a flat fee of $3.15 to make an international call plus $0.05 for every minute that you talk. if you were charged $5.10 for making an international call, for how many minutes did you talk? minutes

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It costs a flat fee of $3.15 to make an international call plus $0.05 for every minute that you talk...
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