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17 July, 17:05

Alex purchased a hour calling card. he has used t minutes of access time. write an algebraic expression to represent how many minutes he has remaining and identify the units for the expression

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  1. 17 July, 18:27
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    60-t, with t representing how much time he has spent, since 60 is the max (t can not go above that, and when t=60 you're done)
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