document.write( "Question 1094697: Find the sum of the first 28 terms of the sequence {an} = {8n+2} \n" ); document.write( "

Algebra.Com's Answer #709250 by greenestamps(13200) $\"\"$ $\"About$

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The first term is 8(1)+2 = 10; the 28th term is 8(28)+2 = 226.
\n" ); document.write( "There are 28 terms; and, because there is a common difference between the terms, the average of all the terms is the average of the first and last terms.
\n" ); document.write( "And then the sum of all the number is that average, multiplied by the number of terms.

\n" ); document.write( " $\"%2810%2B226%29%2F2+=+118\"$ <-- average of all the terms
\n" ); document.write( " $\"118%2A28+=+3304\"$ <-- sum of all 28 terms \n" ); document.write( "

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