SOLUTION: find the sum of the infinite geometric series a1=27 and r= -4/5

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Question 924218: find the sum of the infinite geometric series a1=27 and r= -4/5
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
S+=+a%2F%281-r%29


S+=+27%2F%281+-+%28-4%2F5%29%29


S+=+27%2F%281+%2B+4%2F5%29


S+=+27%2F%285%2F5+%2B+4%2F5%29


S+=+27%2F%289%2F5%29


S+=+27%2A%285%2F9%29


S+=+15


The sum is 15.
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