anonymous
  • anonymous
Check my answer? Find S12 for the series 2 + 5 + 8 +... I think it's 35
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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jim_thompson5910
  • jim_thompson5910
S12 means "the 12th partial sum". It's a lot bigger than 35
anonymous
  • anonymous
Can you explain how to do it please?
jim_thompson5910
  • jim_thompson5910
what is the nth term equal to

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anonymous
  • anonymous
2?
jim_thompson5910
  • jim_thompson5910
the nth term will be some expression with n in it
anonymous
  • anonymous
okay is it 2n then? I'm sorry I'm confused on the section I'm doing.
jim_thompson5910
  • jim_thompson5910
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
anonymous
  • anonymous
okay I got n=1? I feel like I somehow did something wrong in that equation lol
jim_thompson5910
  • jim_thompson5910
\[\Large a_{n} = a_1 + d(n-1)\] \[\Large a_{n} = 2 + 3(n-1)\] \[\Large a_{n} = ???\]
anonymous
  • anonymous
okay thank you I understand the equation now
jim_thompson5910
  • jim_thompson5910
so that simplifies to what?

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