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The graph should show an increase of $ 0.80 for every minute that the call lasts.

A 5 minute phone call costs $ 4, with which, to determine the information that the graph should show, the following calculation must be performed:

  • 4/5 = X
  • 0.80 = X

Therefore, the graph should show an increase of $ 0.80 for every minute that the call lasts.

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