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22 June, 21:38

The cost of a long-distance telephone call is given by the function below, where m is the length of the call in minutes.

C (m) = 0.1m + 1

Determine how long a phone call can be made for $5.50.

A. 40 minutes

B. 90 minutes

C. 45 minutes

D. 50 minutes

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Answers (1)
  1. 22 June, 23:45
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    answer

    45 minutes

    explanation

    using the equation C (m) = 0.1m + 1, C (m) is the cost of the phone call (5.50)

    5.50 = 0.1m + 1 subtract 1 from both sides

    4.5 = 0.1m divide both sides by 0.1

    45 = m

    m is the number of minutes, so 45 minutes
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