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hiralpatel121 Group Title

Can someone please check the attached problems?

  • one year ago
  • one year ago

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  1. JakeV8 Group Title
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    why yes, I would be happy to :)

    • one year ago
  2. hiralpatel121 Group Title
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    • one year ago
  3. imron07 Group Title
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    3b), did you just use negative -500 mg for I(t)?

    • one year ago
  4. JakeV8 Group Title
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    yes, it needs to have been 500 = -3t^2 + 126t

    • one year ago
  5. JakeV8 Group Title
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    try quadratic formula again with 0 = -3t^2 + 126t - 500

    • one year ago
  6. hiralpatel121 Group Title
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    I'm lost.

    • one year ago
  7. JakeV8 Group Title
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    http://www.wolframalpha.com/input/?i=500+%3D+-3t^2%2B126t Ibuprofen level starts at zero, take a pill, levels increase past 500, peak, and drop back below 500. The points the quadratic formula produces are the t values that go with the I(t) levels of 500

    • one year ago
  8. JakeV8 Group Title
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    Start your set up by saying I(t) = Ibuprofen level at time t after taking pill. I(t) = -3t^2 + 126t when is I(t) = 500? I(t) = 500 = -3t^2 + 126t 0 = -3t^2 + 126t - 500 then use quadratic formula. Result is 2 t values which are possible times after taking pill before I(t) level of ibuprofen is equal to 500. The problem asks for the longest time, so you would need to select the larger t value.

    • one year ago
  9. JakeV8 Group Title
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    consolation prize... you had part (a) correct :)

    • one year ago
  10. hiralpatel121 Group Title
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    So 3(a) is correct and I have to fix 3(b)?

    • one year ago
  11. JakeV8 Group Title
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    I think prob 4 is right too.

    • one year ago
  12. JakeV8 Group Title
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    ugh bad laptop! Yes, 3b needs fixing, but you were close... just set up I(t) = 500, put in the expression for I(t), subtract 500 from both sides to get -3t^2 +126t - 500 = 0, and then use quadratic formula

    • one year ago
  13. hiralpatel121 Group Title
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    Okay, thank you!

    • one year ago
  14. JakeV8 Group Title
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    you just jumped into it too fast and put the 500 on the wrong side.

    • one year ago
  15. JakeV8 Group Title
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    Always glad to help... I am really really really really really love the fact that you try these problems first and then post them for us to talk through... that is how this site is SUPPOSED to work!!

    • one year ago
  16. JakeV8 Group Title
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    Now I have to get going though :) see you next time :)

    • one year ago
  17. hiralpatel121 Group Title
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    See you next time :) Thank you so much :)

    • one year ago
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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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