Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

hiralpatel121

  • 2 years ago

Can someone please check the attached problems?

  • This Question is Closed
  1. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    why yes, I would be happy to :)

  2. hiralpatel121
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

  3. imron07
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    3b), did you just use negative -500 mg for I(t)?

  4. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes, it needs to have been 500 = -3t^2 + 126t

  5. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    try quadratic formula again with 0 = -3t^2 + 126t - 500

  6. hiralpatel121
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I'm lost.

  7. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  8. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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.

  9. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    consolation prize... you had part (a) correct :)

  10. hiralpatel121
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    So 3(a) is correct and I have to fix 3(b)?

  11. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I think prob 4 is right too.

  12. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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

  13. hiralpatel121
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Okay, thank you!

  14. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you just jumped into it too fast and put the 500 on the wrong side.

  15. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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!!

  16. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Now I have to get going though :) see you next time :)

  17. hiralpatel121
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    See you next time :) Thank you so much :)

  18. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.