anonymous
  • anonymous
PLEASE HELP ME IM STUCK ON THIS PRE CALC QUESTION??? PLEASE HELP ME FINISH MY WORK! Find an equation for the nth term of the arithmetic sequence. -20, -16, -12, -8, ... Here is what i have so far: d=4 a1=-20 c=a1-d c=-24 an=dn+c an=4n-24 What are my next steps? Please help!
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
These are my answer choices A. an = -20 x 4(n - 1) B. an = -20 + 4(n - 1) C. an = -20 + 4(n + 2) D. an = -20 + 4(n + 1)
jim_thompson5910
  • jim_thompson5910
\[\Large \text{nth term} = (\text{first term}) + (\text{common difference})(n-1)\] \[\Large a_n = a_1 + d(n-1)\]
anonymous
  • anonymous
So, an= -20 + 4(n-1)?

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jim_thompson5910
  • jim_thompson5910
correct
anonymous
  • anonymous
What is that formula called? @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
I'm not sure of the specific name, but you can consider it the nth term of the arithmetic sequence formula
anonymous
  • anonymous
Alright, thank you very much. I did not have that in my notes. Thanks! @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
you're welcome

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