Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

DaWizjr

  • 2 years ago

Find S20 when t1 = 4 and d = 5

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

    Now you have to use formula

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

    tn=t1+(n-1)d

  3. Shadowys
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \(S_{n}=\frac{n}{2} (2 t_1 + (n-1)d)\) sub n=20, and everything you've got there. do u need further help?

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

    cool

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

    S(20=20/2(2(4)+(20-1)5)

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

    And how would I work this out @Shadowys

  7. Shadowys
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    um,simplify this then. \(\frac{20}{2}[(2)(4)+(20-1)5]=10[8+19(5)]\) what follows can be done by manual arithmetic or a calculator.

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

    I got 1030

  9. Shadowys
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yup, that's what I got too. :)

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

    Cool

  11. 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.