anonymous
  • anonymous
PLEASE answer quicky! Will give medal: What is the sum of a 6-term geometric sequence if the first term is 11, the last term is –11,264 and the common ratio is –4?
Mathematics
jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
\[S_n=a\frac{1-r^n}{1-r}\] here n=6, a=11 and r = -4
anonymous
  • anonymous
the answer is -9,009?
amistre64
  • amistre64
the numbers you give dont seem to coincide unless that -11,264 is spose to be some random number off in the distance past the 6th term

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amistre64
  • amistre64
well, now they do, i was inputing it wrong in the wolf
amistre64
  • amistre64
so yeah; that should be it. you have alternating positives and negatives
anonymous
  • anonymous
ok
amistre64
  • amistre64
http://www.wolframalpha.com/input/?i=sum+%2811*%28-4%29%5E%28n-1%29%29+from+1+to+6 works out both ways :)

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