document.write( "Question 856103: This is a question on my study guide for my test and I don't know how to solve this. If I can't figure this out, then I might fail my test. Please help me! I would greatly appreciate it.\r
\n" ); document.write( "\n" ); document.write( "The population of a local species of dragonfly can be found using an infinite geometric series where a1 = 36 and the common ratio is 1/2. Write the sum in sigma notation and calculate the sum that will be the upper limit of this population.
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Algebra.Com's Answer #515739 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
 
\n" ); document.write( "Hi,
\n" ); document.write( "a1 = 36 and r = 1/2= .5
\n" ); document.write( "\"a%5Bn%5D+=+36%28.5%29%5E%28n-1%29\" |.5| < 1
\n" ); document.write( "\"sum%28+a%5Bn%5D%2Cn=1%2C+infinity+%29\" = \"a%5B1%5D%2F%281-r%29\"
\n" ); document.write( "\"sum%28+36%28.5%29%5E%28n-1%29%2Cn=1%2C+infinity+%29\" = \"36%2F%281%2F2%29\" = 72 \n" ); document.write( "
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