If a phone company charges $0.40 for the first minute and $0.25 for each additional minute for a long-distance call, how long did you talk if the phone call cost $5.40?

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Alden Holder · Accepted Answer

let duration of long-distance call is x minutesgiven company charges $0.40 for the first minute and $0.25 for each additional minute for a long-distance calltotal call cost   =  0.40  ⋅  1  +  0.25  (  x  −  1  )total call cost   =  0.40  +  0.25  x  −  0.25total call cost   =  0.15  +  0.25  xgiven phone call cost $5.40  0.15  +  0.25  x  =  5.40    0.25  x  =  5.40  −  0.15    0.25  x  =  5.25    x  =      5.25    0.25      x  =  21duration of long-distance call is 21 minutes

If a phone company charges $0.40 for the first minute and $0.25 for each additional minute for a long-distance call, how long did you talk if the phone call cost $5.40?

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