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anonymous

  • one year ago

Check my answer? Find S12 for the series 2 + 5 + 8 +... I think it's 35

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  1. jim_thompson5910
    • one year ago
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    S12 means "the 12th partial sum". It's a lot bigger than 35

  2. anonymous
    • one year ago
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    Can you explain how to do it please?

  3. jim_thompson5910
    • one year ago
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    what is the nth term equal to

  4. anonymous
    • one year ago
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    2?

  5. jim_thompson5910
    • one year ago
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    the nth term will be some expression with n in it

  6. anonymous
    • one year ago
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    okay is it 2n then? I'm sorry I'm confused on the section I'm doing.

  7. jim_thompson5910
    • one year ago
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    first term is a1 = 2 common difference is d = 3 you plug those things into an = a1 + d(n-1) to get the nth term

  8. anonymous
    • one year ago
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    okay I got n=1? I feel like I somehow did something wrong in that equation lol

  9. jim_thompson5910
    • one year ago
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    \[\Large a_{n} = a_1 + d(n-1)\] \[\Large a_{n} = 2 + 3(n-1)\] \[\Large a_{n} = ???\]

  10. anonymous
    • one year ago
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    okay thank you I understand the equation now

  11. jim_thompson5910
    • one year ago
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    so that simplifies to what?

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