document.write( "Question 1164850: -10, -7, -4, -1, 2, 5, 8, 11, 14, 17, 20. How to turn this into Sigma notation. Please
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Algebra.Com's Answer #789499 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Did you mean:\r\n" );
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document.write( "(-10)+(-7)+(-4)+(-1)+(2)+(5)+(8)+(11)+(14)+(17)+(20)\r\n" );
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document.write( "with plus signs between?\r\n" );
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document.write( "If so, find the general formula for the arithmetic sequence with\r\n" );
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document.write( "\"a%5B1%5D=-10\"\"and\"\"d=3\"\r\n" );
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document.write( "by substituting in:\r\n" );
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document.write( "\"a%5Bn%5D=a%5B1%5D%2B%28n-1%29d\"\r\n" );
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document.write( "\"a%5Bn%5D=-10%2B%28n-1%293\"\r\n" );
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document.write( "\"a%5Bn%5D=-10%2B3n-3\"\r\n" );
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document.write( "\"a%5Bn%5D=3n-13\"\r\n" );
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document.write( "Then summing that from 1 to 11, since there are 11 terms:\r\n" );
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document.write( "\"sum%28%283n-13%29%2Cn=1%2C11%29\"\r\n" );
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document.write( "Edwin
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