document.write( "Question 853286: Use summation notation to write the series 2.2+8.8+15.4+... for 5 terms. \n" ); document.write( "
Algebra.Com's Answer #513999 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "2.2+8.8+15.4+...\r\n" );
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document.write( "8.8-2.2 = 6.6\r\n" );
document.write( "15.4-8.8 = 6.6\r\n" );
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document.write( "d = 6.6\r\n" );
document.write( "a1 = 2.2\r\n" );
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document.write( "nth term = a1+(n-1)d = 2.2+(n-1)(6.6) = 2.2+6.6n-6.6 = 6.6n-4.4\r\n" );
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document.write( "\"sum%28%286.6n-4.4%29%2Cn=1%2C5%29\"\r\n" );
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document.write( "That's probably as far as you were expected to take it, but\r\n" );
document.write( "it can be simplified as\r\n" );
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document.write( "\"sum%28%286.6n%29%2Cn=1%2C5%29%2Bsum%28%28-4.4%29%2C1%2C5%29\"\"%22%22=%22%22\"\"6.6sum%28%28n%29%2Cn=1%2C5%29-4.4sum%281%2C1%2C5%29\"\"%22%22=%22%22\"\"6.6sum%28%28n%29%2Cn=1%2C5%29-4.4%285%29\"\"%22%22=%22%22\"\"6.6sum%28%28n%29%2Cn=1%2C5%29-22\"\r\n" );
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document.write( "Edwin
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