anonymous
  • anonymous
what is the sum of the geometric sequence -3 , 18, -108 if there are 7 terms?
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
The answer choices are: -719,835 -119,973 119,973 719,835
anonymous
  • anonymous
Yes
anonymous
  • anonymous
Noo

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anonymous
  • anonymous
There are four answer choices
welshfella
  • welshfella
Sum of n terms = a1 r^n - 1 ------- r - 1 whre a1 = first term and r = common ratio
welshfella
  • welshfella
so plug in a1 = 8 , r = -6 and n = 7
welshfella
  • welshfella
sorry a1 = -3
anonymous
  • anonymous
So it's -3(-6)^7-1 over -6-1?
welshfella
  • welshfella
not exactly - work out the (-6)^7 first then subtract 1 then divide by -7 finally multiply by -3
anonymous
  • anonymous
I got -119,973 is that right?
welshfella
  • welshfella
I should have written the (r^n - 1) like that - in parentheses
welshfella
  • welshfella
yes
anonymous
  • anonymous
Okay thank you very much
welshfella
  • welshfella
yw
welshfella
  • welshfella
oh = press best response
anonymous
  • anonymous
I did

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