Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

yasmeenabutineh

  • 3 years ago

What is the sum of a 6-term geometric sequence if the first term is 11, the last term is –11,264 and the common ratio is –4?

  • This Question is Closed
  1. dumbcow
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \[\large s_{n} = \frac{a_{1}(r^{n}-1)}{r-1}\]

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

    n =6 a1 = 11 r = -4

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

    does that make sense?

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

    sn=11(-4-1)/-4-1?

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

    yes except the " -4" on top should be raised to the 6th power

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

    okay so -4^6-1?

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

    yep

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

    make sure you include the negative sign when raising to power.....-4^6 is different than (-4)^6

  9. 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.