document.write( "Question 1085483: 1) What is a possible expression for the series
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Algebra.Com's Answer #699561 by Edwin McCravy(20063)\"\" \"About 
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1) What is a possible expression for the series
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That's a geometric series with a1=-6 and common ratio =r=2\r\n" );
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2) What is a possible expression for the series
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document.write( "That would be an arithmetic series with a1=-7 and common \r\n" );
document.write( "difference = d = 5 if it weren't for the alternating signs.  So we\r\n" );
document.write( "use the arithmetic series formula and multiply by the sign changing\r\n" );
document.write( "factor (-1)n\r\n" );
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document.write( "Edwin
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