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Ilia_Sergeevich [38]
3 years ago
15

Define a variable, write an equation, and solve.

Mathematics
1 answer:
allochka39001 [22]3 years ago
3 0

Answer:

  • c(m) = 39.95 +0.35m
  • 85 minutes over 500

Step-by-step explanation:

Let m represent the number of minutes used over 500. Then the cost of the cell phone plan is ...

  c(m) = 39.95 +0.35m

__

For a cost of 69.70, the number of excess minutes can be found by solving ...

  69.70 = 39.95 +0.35m

  29.75 = 0.35m . . . . . . . . . subtract 39.95

  29.75/0.35 = m = 85 . . . . divide by the coefficient of m

The number of minutes of usage over 500 is 85.

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