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The equation C=mx+b can be used to model the monthly cost, C, of a cell phone plan where b is the flat monthly cost, m represents the cost in dollars per minute and x is the number of minutes used in the month. Choose a flat monthly rate and cost per minute and insert the values you have chosen for m and b into the equation. Then use this equation to find the total monthly cost, C, if 73 minutes are used.

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2 answers
  1. C=.25(73)+B

    C=18.25+80.00

    C=$98.25 Monthly

    The monthly cell phone costs are $98.25.

    Is this what you wanted or something else?

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  2. Not what I wanted, but it fulfills the requirements of the problem.

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