A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

Are these all the same? #1. A=lim as n approaches infinity of sigma ("n" on top of sigma, i=1 on bottom of sigma) f(x subscript i)times delta x #2. A=same as the above until sigma, times f(x subscript i-1) times delta x #3. A=same as above till' sigma, f(xi*) times delta x....this is for integrals, areas under curves

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

    No i believe #1 gives upper bounds area and #2 gives lower bounded area, not sure about #3 can you rewrite that part

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

    A=lim as n approaches infinity, sigma (on top of sigma it says "n", bottom of sigma it says "i=1") and then f[xi (note, theres a * star symbol on top of i)]delta x

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

    \[A=\lim_{n \rightarrow \infty}\sum_{i=1}^{n} f(x*i)Deltax\] Note: where it says f(x*i), I meant the * is right on top of the i, which is a subscript of x)

  4. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    All I know is that * has something to do with sample points, but I dont get that part

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

    ok i think it has to do with taking the midpoint between xi and xi-1, ->f(xi-1 + deltax/2) this will give an area between the upper and lower bounds yielding a more accurate approximation of the actual area under the curve

  6. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you!

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.