document.write( "Question 48756: Use the arithmetic sequence of numbers 2, 4, 6, 8, 10, what is the sum of the first 30 terms? I came up with 930, am I correct? \r
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Algebra.Com's Answer #32284 by AnlytcPhil(1806)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Use the arithmetic sequence of numbers\r\n" );
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document.write( "2, 4, 6, 8, 10,\r\n" );
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document.write( "what is the sum of the first 30 terms?\r\n" );
document.write( "I came up with 930, am I correct? \r\n" );
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document.write( "2nd term - 1st term =  4 - 2 = 2\r\n" );
document.write( "3rd term - 2nd term =  6 - 4 = 2\r\n" );
document.write( "4th term - 3rd term =  8 - 6 = 2\r\n" );
document.write( "5th term - 4th term = 10 - 8 = 2\r\n" );
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document.write( "These are all 2, so the common difference, d = 2.\r\n" );
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document.write( "The sum of the first n terms is given by the formula\r\n" );
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document.write( "Sn = n[2a1 + (n-1)d]/2\r\n" );
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document.write( "n = 30, a1 = 2, d = 2\r\n" );
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document.write( "S30 = 30[2(2) + (30-1)(2)]/2\r\n" );
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document.write( "S30 = 30[4 + (29)(2)]/2\r\n" );
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document.write( "S30 = 30(4 + 58)/2\r\n" );
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document.write( "S30 = 30(62)/2 \r\n" );
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document.write( "S30 = 1860/2\r\n" );
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document.write( "S30 = 930\r\n" );
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document.write( "Looks like you're right!\r\n" );
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document.write( "-------------------------------------------\r\n" );
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document.write( "Also how do I type in the term or subscript? \r\n" );
document.write( "Ex: a1 a2 a3.....\r\n" );
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document.write( "With HTML tags.  To type\r\n" );
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document.write( "a1 \r\n" );
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document.write( "you have to type \r\n" );
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document.write( "a< sub>1< /sub>\r\n" );
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document.write( "except you close those spaces after the < 's. I didn't \r\n" );
document.write( "here because if I had you'd have only seen a1.\r\n" );
document.write( "I don't type the tags individually.  That takes too long.\r\n" );
document.write( "I put the tags in after I finish, using 'cut and paste'.\r\n" );
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document.write( "Edwin
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