anonymous
  • anonymous
What is the sum of the geometric sequence -4, 24, -144, ... if there are 8 terms? (5 points)
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
Owlcoffee
  • Owlcoffee
First find the geometric ratio.
anonymous
  • anonymous
would that be -4/24?

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Owlcoffee
  • Owlcoffee
yes
anonymous
  • anonymous
-.167
Owlcoffee
  • Owlcoffee
Good, now, use the formula for the sum of a finite number of terms: \[S_n = \frac{ a_1 (1-r^n) }{ 1-r }\] Where "r" is the ratio, a1 is the first term and "n" the number of the desired terms to add.
anonymous
  • anonymous
nvm i got it
Owlcoffee
  • Owlcoffee
well done <3
anonymous
  • anonymous
ty<3 GIVE ME A MEDAL GAB ):

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