A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

What are the next three terms of the sequence 1, -3, 9, -27,…? A. -54, 162, -486 B. -81, 243, -729 C. 81, -243, 729 D. 57, -162, 486

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

    Ridiculous problem. Finite sequences have infinitely many "next three terms". ANYTHING you can justify is an acceptable answer. 1, -3, 9, -27, 0, -2, 5 -- That works. 1, -3, 9, -27, 28, -29, 5 -- That works. 1, -3, 9, -27, \(\sqrt{5}\), \(\pi\), e -- That works. What say you? Give us a clue what YOU might think are three acceptable values and justify your response.

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

    Well, I thought it was 57, -162, 486, but I really wasn't sure, so I came on here for some help..

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

    It's not a matter of being sure. It's a matter of justifying your answer. How did you get those three values?

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

    If you're having trouble with this, try breaking it down. The sequence itself has 4 values in it already. What did the 1 do to become -3?

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

    Generally, it's a good idea to look for common differences or common ratios. Subtract each successive pair. What do you get? Divide each successive pair. What do you get?

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

    i really don't understand

  7. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1*(-3) =?

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

    -3

  9. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Now, second term -3*(-3) =?

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

    9

  11. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Now, third term 9*(-3) =?

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

    -27

  13. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    can you see your answers are the term of the given sequence??

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

    oh, yeah! Thank you so much! I get it now :)

  15. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so, next will be???

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

    81

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

    then it'll be -243

  18. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes!! look at your options, which is correct.

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

    c! Thanks again :)

  20. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    No need to do next, since there is only 1 option which starts at 81, It is C

  21. Loser66
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    YOu got it. hehehe...

  22. 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.