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$5 for easy math question

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  1. TheProf1 TheProf1 is offline

    The Colony, TX
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    Feb 4th, 2009 (2/4/2009 8:03pm)

    I guess I am stupid, because I can't remember the right formula to figure this out and it's not on the notes. 5 bucks on starts for the right answer and formula.

    A 75mg dose of penicillin is given to a patient. Pinicillin leaves the body at a rate jof 6.5% per hour.
    Find a formula for the amount A(mg) of penicillin in the body t hours after the dose is given.

    I thought it was A=75-.935t but it isn't working out I don't think.
  2. DaVols DaVols is offline

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    Feb 4th, 2009 (2/4/2009 8:05pm) in reply to TheProf1

    A = 75 - 75*.065t if it is 6.5% of the total dose

    A = 75*(.935^t) if it is 6.5% of what is remaining in the body
  3. moscow01 moscow01 is offline

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    Feb 4th, 2009 (2/4/2009 8:06pm) in reply to TheProf1

    It's a trick question - 75mg dose does not exist. It comes in 100mg only.......

    And lol at easy question.
  4. ZeeDustin ZeeDustin is offline

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    Feb 4th, 2009 (2/4/2009 8:06pm) in reply to DaVols

    Prof, if that is the real formula, you are going to fail math sir.
  5. TheProf1 TheProf1 is offline

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    Feb 4th, 2009 (2/4/2009 8:16pm) in reply to DaVols

    So which one is it? Because the next question says how much is left in the body after 24 hours and if you use the first formula it's -42 so its 0. So I guess it's a trick question?
    Thread Starter
  6. DaVols DaVols is offline

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    Feb 4th, 2009 (2/4/2009 8:24pm) in reply to TheProf1

    What exactly does the question say
  7. TheProf1 TheProf1 is offline

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    Feb 4th, 2009 (2/4/2009 8:26pm) in reply to DaVols

    I wrote exactly what it said. The firse sentence is the information and the second sentence is the exact question.
    Thread Starter
  8. ud2 ud2 is offline

    Congo, The Democratic Republic of the

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    Feb 4th, 2009 (2/4/2009 8:28pm) in reply to TheProf1

    What's 2 + 2?

    ud2 on fulltilt, thanks.

    read the title, not the post
  9. DaVols DaVols is offline

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    Feb 4th, 2009 (2/4/2009 8:28pm) in reply to TheProf1

    if you're studying linear equations, then it'll be the first one...if you're studying decay, etc then the 2nd one
  10. TheProf1 TheProf1 is offline

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    Feb 4th, 2009 (2/4/2009 8:31pm) in reply to TheProf1

    Here is why I am confused. Because, it says in my notes that if r is the decimal rate of change, then a=1 +or- r

    so it should be 1-.065, which equals .9350. so .9350 is in the equation somewhere.
    I just don't know what the damn formula looks like, because we had a snow day and he told us to figure it out ourselves. I HATE CALCULAS
    Thread Starter
  11. TheProf1 TheProf1 is offline

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    Feb 4th, 2009 (2/4/2009 8:32pm) in reply to DaVols

    were doing growth and decay. It's fucked up because your second formula is right as long as it's growth, but when you use it for decay it gives crazy answers.
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  12. TheProf1 TheProf1 is offline

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    Feb 4th, 2009 (2/4/2009 8:34pm) in reply to TheProf1

    Nevermind, your right. It's the second equation. Thanks. Whats your name on stars and where are you from?
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  13. Admiral Admiral is offline

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    Feb 4th, 2009 (2/4/2009 8:35pm) in reply to TheProf1

  14. gank gank is offline 'tis always ganktober

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    Feb 4th, 2009 (2/4/2009 8:36pm) in reply to TheProf1

    The answer it will never leave the body. It will get small enough that it is insignificant, but there will always be an amount of penicillin in your body.
    exp.
    Start with 100
    Take 6.5% away from it
    Continue taking 6.5% away
    Your # will get rediculously small, but you will never get it to reach 0, just have a lot of .000000000000000000's
    gank on stars, ship it.
     1
  15. DaVols DaVols is offline

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    Feb 4th, 2009 (2/4/2009 8:36pm) in reply to TheProf1

     
    Originally Posted by TheProf1 View Post

    Nevermind, your right. It's the second equation. Thanks. Whats your name on stars and where are you from?

    DaVols2k7 from Wilmington
  16. TheProf1 TheProf1 is offline

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    Feb 4th, 2009 (2/4/2009 8:40pm) in reply to DaVols

    shipped davols. Sorry gank a little to late.
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  17. gank gank is offline 'tis always ganktober

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    Feb 4th, 2009 (2/4/2009 8:41pm) in reply to TheProf1

     
    Originally Posted by TheProf1 View Post

    shipped davols. Sorry gank a little to late.

    ghey
     1
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