document.write( "Question 934335: What are the steps to solve this question:\r
\n" ); document.write( "\n" ); document.write( "Find the sum of the first n terms of each arithmetic sequence.\r
\n" ); document.write( "\n" ); document.write( "-5, -1, 3....; n=17 \n" ); document.write( "
Algebra.Com's Answer #567362 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
In this case, the first term is a1 = -5 and the common difference is d = 4 (eg: -1 minus -5 = 4)\r
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\n" ); document.write( "\n" ); document.write( "Sn = n*(a1 + an)/2\r
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\n" ); document.write( "\n" ); document.write( "Sn = n*(a1 + a1 + d*(n-1))/2\r
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\n" ); document.write( "\n" ); document.write( "Sn = n*(2a1 + d*(n-1))/2\r
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\n" ); document.write( "\n" ); document.write( "Sn = n*(2*(-5) + 4*(n-1))/2\r
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\n" ); document.write( "\n" ); document.write( "S17 = 17*(2*(-5) + 4*(17-1))/2\r
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\n" ); document.write( "\n" ); document.write( "S17 = 459\r
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\n" ); document.write( "\n" ); document.write( "Jim\r
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