Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

AGummiBear55

  • 2 years ago

How do I do this problem? n an 1 1 2 6 3 11 4 16 When n equals 8, what does an equal?

  • This Question is Closed
  1. wio
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    You can tell it's an arithmetic sequence because \[ \large a_{n+1} -a_n=5 \]

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

    Arithmetic sequences have the form: \[ a_n = a_1 + (n-1)d \]

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

    In this case \(d = 5\) and \(a_1=1\), so our equation is \[ a_n = 1 + (n-1)5 \]

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

    But that is not the question... your formula is:\[a_n = a_1 + (n - 1)d\]The \(d\) was stated by @wio: \(5\).

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

    So you want to substitute \(n=8\) into the equation to find \(a_8\).

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

    So, the formula is:\[a_n = 1 + 5(n - 1)\]Now substitute \(n = 8\).

  7. AGummiBear55
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So the answer would be 36, correct?

  8. wio
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Yes

  9. AGummiBear55
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    :D Thank you both, yall were A LOT of help!! <3

  10. 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.