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The piecewise function representing Tracy's cell phone charges can be defined as follows:

[ f(m) = \begin{cases} 29 & \text{if } m \leq 250 \ 29 + 0.35(m - 250) & \text{if } m > 250 \end{cases} ]

Here, ( m ) represents the total minutes used. The first case states that if Tracy uses 250 minutes or fewer, she pays the flat rate of $29. In the second case, for every minute over 250, she pays an additional $0.35.

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4w ago

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