document.write( "Question 1086467: 1) determine the sum of the arithmetic series 19.5+14+8.5+...t24\r
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Algebra.Com's Answer #700887 by Edwin McCravy(20056)\"\" \"About 
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1) determine the sum of the arithmetic series 19.5+14+8.5+...t24
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document.write( "t2-t1 = 14-19.5 = -5.5 = d\r\n" );
document.write( "t3-t2 =  8.5-14 = -5.5 = d\r\n" );
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document.write( "\"S%5Bn%5D=expr%28n%2F2%29%282t%5B1%5D%2B%28n-1%29d%29\"\r\n" );
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document.write( "Substitute n = 24, t1 = 19.5, and d = -5.5,\r\n" );
document.write( "to find S24 \r\n" );
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\n" ); document.write( "2)Determine the value of t1 for an arithmetic sequence,
\n" ); document.write( " where d=-4 and S14 = 1120
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document.write( "\"S%5Bn%5D=expr%28n%2F2%29%282t%5B1%5D%2B%28n-1%29d%29\"\r\n" );
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document.write( "Substitute n = 14, d = -4, then substitute S14 = 1120. \r\n" );
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document.write( "Then solve for t1.\r\n" );
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document.write( "Edwin
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