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Math Help - Exponential Growth/Decay Word Problems

  1. #1
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    Exponential Growth/Decay Word Problems

    I have a few word problems I'm working on, a bit confused. If any help is given, I'd appreciate it.

    7. To determine whether a pancreas is functioning normally, a tracer dye is injected. A normally functioning pancreas secrets 4% of the dye each minute. A doctor injects 0.50g of the dye. Twenty minutes later, 0.35g remain. If the pancreas were functioning normally, how much dye should remain?

    I'll post the others later if I can't work through them.

    Thanks again.
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  2. #2
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    I think I worked out #7.

    Tell me if this is right:

    Pancreas leaves 0.35g remaining.
    Fv = Iv(%)^x
    Fv = 0.50(0.96)^20
    Fv = 0.221

    Therefore, if the pancreas were functioning normally, 0.22g would remain.

    Is this correct?
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Jeavus View Post
    I think I worked out #7.

    Tell me if this is right:

    Pancreas leaves 0.35g remaining.
    Fv = Iv(%)^x
    Fv = 0.50(0.96)^20
    Fv = 0.221

    Therefore, if the pancreas were functioning normally, 0.22g would remain.

    Is this correct?
    looks good to me
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