document.write( "Question 258725: Answer the following. Please show your work.
\n" ); document.write( "1+14+27+...+183
\n" ); document.write( " Step 1: Using the formula for the sum of an arithmetic series, find the value of each of the following:
\n" ); document.write( "a[1]= a[2]= a[n]= and d=a[2]-a[1]=\r
\n" ); document.write( "\n" ); document.write( " Step 2: Find n, the number of terms in the arithmetic sequence. Use the formula a[n]=a[1]+(n-1)d\r
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\n" ); document.write( "\n" ); document.write( " Step 3: Find the sum of the arithmetic sequence.
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Algebra.Com's Answer #190470 by Fombitz(32388)\"\" \"About 
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1+14+27+...+183
\n" ); document.write( "\"d=14-1=13\"
\n" ); document.write( "\"d=27-14=13\"
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\n" ); document.write( "\"+183=1%2B%28n-1%2913\"
\n" ); document.write( "\"182=%28n-1%2913\"
\n" ); document.write( "\"14=n-1\"
\n" ); document.write( "\"n=15\"
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\n" ); document.write( "\"a1=1\"
\n" ); document.write( "\"a2=a1%2B13\"
\n" ); document.write( "\"a3=a2%2B13=a1%2B13%2B13=a1%2B2%2813%29\"
\n" ); document.write( "\"a4=a3%2B13=a2%2B13%2B13=a1%2B13%2B13%2B13=a1%2B3%2813%29\"
\n" ); document.write( "So then the sum from 1 to n is
\n" ); document.write( "Sum=n+Sum(1 to n)*13
\n" ); document.write( "The sum from 1 to n=\"n%28n-1%29%2F2\"
\n" ); document.write( "Sum=\"n%2Bn%28n-1%29%2A%2813%2F2%29\"
\n" ); document.write( "Since n=15,
\n" ); document.write( "Sum(1-15)=\"15%2B15%2814%2913%2F2=15%2B1365=1380\".
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