document.write( "Question 481797: Hello, I am stuck with this problem and cannot seem to find any help.\r
\n" ); document.write( "\n" ); document.write( "I need to find s6 of a geometric sequence. Given are $\"b3+=+9\"$ and $\"b6=+-64%2F3\"$ \r
\n" ); document.write( "\n" ); document.write( "I know to find the sum I would need to use $\"sn=a1%2A%281-r%5En%29%2F%281-r%29\"$ but for that I would need the 1st term of the sequence. I simply do not know how I can find the common ratio to find the first sequence and $\"an=a1%2Ar%5En-1\"$ is not helping me there since I have 2 unknown.\r
\n" ); document.write( "\n" ); document.write( "Thank you a lot \n" ); document.write( "

Algebra.Com's Answer #329871 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "geometric sequence
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document.write( "   = 9/r^2
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document.write( "         
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document.write( "                   r^3 = -64/27 
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document.write( "                     r= -4/3   and 
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document.write( "         \n" );
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