Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

BarlowGirl

PLEASE HELP!!!!! URGENT!!!! Please show steps for the attached problem . . .

  • one year ago
  • one year ago

  • This Question is Closed
  1. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    Evaluate - |dw:1339003375467:dw|

    • one year ago
  2. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    I got an answer of 91, but the answer choices for the problem don't include that as an answer.

    • one year ago
  3. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    since you only have 5 terms, might as well just add them up... 4^2 + 5^2 + 6^2 + 7^2 + 8^2 + 9^2 = 16 + 25 + 36 + 49 + 64 + 81 = ???

    • one year ago
  4. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    Wait a second, though - aren't there 6 terms (4,5,6,7,8,9)? Don't you include the the k= number AND the number above sigma?

    • one year ago
  5. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    you're add k^2 so starting from k=4 to k= 9, you add 4^2 + 5^2 + ... 9^2

    • one year ago
  6. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    you should get 271 as the sum of those squares

    • one year ago
  7. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    Here's the equation for a quadratic series, in case you'd like it: |dw:1339003827921:dw|

    • one year ago
  8. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh, I see what you're saying. Why doesn't the formula work for this problem, though?

    • one year ago
  9. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    that is correct.. but you'll have to subtract k=1 to k=3...|dw:1339003974534:dw|

    • one year ago
  10. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1339004031135:dw|

    • one year ago
  11. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    Sorry, I'm a bit confused - what does that mean - "you'll have to subtract k=1 to k=3..." ?

    • one year ago
  12. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    so you can use that formula.... but isn't it easier to just write down those 6 terms and add them all up?

    • one year ago
  13. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes, I do think it's easier, but I wanted to figure out how I could use it with the formula. I don't believe my teacher taught us to subtract the k values - that's why I'm confused.

    • one year ago
  14. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1339004126864:dw|

    • one year ago
  15. BarlowGirl
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh, okay. Thank you very much for your explanation! You've been most helpful! =)

    • one year ago
  16. dpaInc
    Best Response
    You've already chosen the best response.
    Medals 2

    yw....:)

    • one year ago
    • Attachments:

See more questions >>>

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.