anonymous
  • anonymous
What is the sum of a 17-term arithmetic sequence where the first term is 7 and the last term is -105?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
whoevers first
cwrw238
  • cwrw238
the formula for this is Sum = ( n/2){ a + l) whre n = number of terms , a = first term and l = last term
anonymous
  • anonymous
(-105-7)/16=-7(common difference) (-105+7)(-105-7+7)/(-14)=-810

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anonymous
  • anonymous
-833 -893 -913 -943 these are the choices
cwrw238
  • cwrw238
= 8.5 *(7 - 105)
cwrw238
  • cwrw238
= -833
anonymous
  • anonymous
833, but i got a positvie
anonymous
  • anonymous
Thank you!
anonymous
  • anonymous
yes i had a mistake. sorry :)

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