anonymous
  • anonymous
What is the sum of a 7-term geometric series if the first term is 6, the last term is 24,576, and the common ratio is -4? -32,766 -19,662 19,662 32,766
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@dan815
anonymous
  • anonymous
@Preetha
anonymous
  • anonymous
@pooja195

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anonymous
  • anonymous
@welshfella
anonymous
  • anonymous
@welshfella
anonymous
  • anonymous
i WILL MEDAL/FAN PLEASE HELP!
alekos
  • alekos
\[\sum_{i=1}^{n}a _{i} = a _{1}\frac{ 1-r ^{n} }{1-r }\]
anonymous
  • anonymous
I dont understand the formula
alekos
  • alekos
just plug the values in the RHS and you'll get the sum
alekos
  • alekos
a1=6, r=-4 and n=7
anonymous
  • anonymous
What values?
anonymous
  • anonymous
Oh okay
anonymous
  • anonymous
I got 19,664.4
anonymous
  • anonymous
ans is -19662
anonymous
  • anonymous
How did u get that?
anonymous
  • anonymous
@AHSHAJHASJDHS ur ans is wrong,,,,according to me...
alekos
  • alekos
no your both wrong
anonymous
  • anonymous
ok wait i am expplaining
anonymous
  • anonymous
Can you help me get to the right answer? Mine didnt even match
alekos
  • alekos
\[6 \frac{ 1-(-4)^{7} }{1-(-4)}\]
alekos
  • alekos
this is what you need to calculate
anonymous
  • anonymous
I got 19,662
anonymous
  • anonymous
(6) 16385 ------- = 3277 (6) = 19662 5
anonymous
  • anonymous
Is that right?
anonymous
  • anonymous
alekos
  • alekos
Yep, thats it

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