A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Write the sum using summation notation, assuming the suggested pattern continues. -9 - 3 + 3 + 9 + ... + 81

  • This Question is Closed
  1. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @hartnn what about this

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

    what would you multiply to current term to get next term ?

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

    add 6?

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

    multiply/add/divide/subtract**

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

    ok

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

    summation of the quantity negative nine plus six n from n equals zero to fifteen summation of negative fifty four times n from n equals zero to fifteen summation of negative fifty four times n from n equals zero to infinity summation of the quantity negative nine plus six n from n equals zero to infinity

  7. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    those are the choices

  8. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ik we can cross out the last 2 because they are infinity and this one ends with 81

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

    yes, adding 6 is correct, so this is indeed an arithmetic series, lets find the n'th term equation for that \(a_n = a_1 +(n-1)d\) we know d - common difference = 6 a1 = 1st term = -9 plug in!

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

    and you're right! this is a finite series, the answer is from 1st 2 choices only :)

  11. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -9+6(n-1)

  12. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so it would be the first choice?

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

    yes, thats correct :)

  14. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you again!

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

    welcome ^_^

  16. 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.