anonymous
  • anonymous
Find the sum of the first 9 terms of the sequence. Show all work for full credit. 2, -7, -16, -25, ...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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welshfella
  • welshfella
this is an arithmetic series with common difference -9
anonymous
  • anonymous
im really confused on how to solve it
welshfella
  • welshfella
Sn = (n/2)[2a1 + (n -1)d] where a1 = first rems, n = number of terms and d = common difference

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welshfella
  • welshfella
Sn is sum of n terms , here n = 9
welshfella
  • welshfella
just plug the values into the formula
anonymous
  • anonymous
oh ok thanks. i understand
welshfella
  • welshfella
yw
welshfella
  • welshfella
your answer is approximately -300

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