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27 December, 09:10

For a long-distance person-to-person telephone call, a telephone company charges $ 0.21 for the first minute, $ 0.17 for each additional minute, and a $ 1.59 service charge. If the cost of a call is $ 2.31 comma how long did the person talk?

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Answers (2)
  1. 27 December, 09:15
    0
    4 minutes

    Step-by-step explanation:

    0.21+1.59=1.8

    2.31=0.17x+1.8

    Subtract 1.8 from both sides

    0.51=0.17x

    Divide both sides by 0.17

    3=x

    3 minutes plus the original minute spent talking

    They spent 4 minutes total talking on the phone
  2. 27 December, 09:38
    0
    4 minutes

    Step-by-step explanation:

    total cost is $2.31

    subtract $ 2.31-1.59 = 0.72 (base fee)

    then $0.72-0.21=$0.51 (first minute fee)

    lastly $0.51/0.17=3 (amount for each additional fee)

    so then just add the first additional minutes with the amount from the additional minutes (3) to get a total of 4 minutes
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