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calculusxy

  • one year ago

A long distance phone call costs $10.00 for the first ten minutes and $0.75 for each additional thirty seconds. If Andre has $16.65, he can talk for (A) 13 minutes and 30 seconds (B) 14 minutes (C) 14 minutes and 30 seconds (D) 15 minutes (E) 17 minutes and 30 seconds

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  1. calculusxy
    • one year ago
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    @phi @jim_thompson5910

  2. jim_thompson5910
    • one year ago
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    were you able to set up the equation?

  3. calculusxy
    • one year ago
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    I have \[$10 + $0.75x = $16.65\] I am not sure if that's correct

  4. jim_thompson5910
    • one year ago
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    good, where x is the number of 30 second intervals (after the 10 minutes are used up)

  5. jim_thompson5910
    • one year ago
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    solve for x to get x = ??

  6. calculusxy
    • one year ago
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    It's like a decimal that can be rounded to 8.87

  7. jim_thompson5910
    • one year ago
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    let's make x a whole number so round that down to x = 8

  8. jim_thompson5910
    • one year ago
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    we don't round up to x = 9 because then we'd go over budget

  9. jim_thompson5910
    • one year ago
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    if x = 8, then he can talk an additional 8*30 = 240 seconds = 4 minutes

  10. calculusxy
    • one year ago
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    30 x 9 = 270 seconds

  11. jim_thompson5910
    • one year ago
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    no, like I said, we can't bump up to 9 because we'd go over our budget

  12. calculusxy
    • one year ago
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    oh sorry

  13. calculusxy
    • one year ago
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    i meant to put 30 x 8

  14. calculusxy
    • one year ago
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    240 seconds / 60 seconds = 4 minutes 14 minutes

  15. calculusxy
    • one year ago
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    is that correct ?

  16. jim_thompson5910
    • one year ago
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    yep, 14 minutes is the final answer

  17. calculusxy
    • one year ago
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    thank you!

  18. jim_thompson5910
    • one year ago
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    no problem

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