document.write( "Question 1098032: The sum of the 1st and 2nd terms of an AP is 4 and the 10th term is 19
\n" ); document.write( "Find d sum of the 5th and 6th terms
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Algebra.Com's Answer #712439 by greenestamps(13200)\"\" \"About 
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If the first term is a and the common difference is d, then the sum of the first two terms is a + (a+d) = a+2d, and the 10th term is a+9d.

\n" ); document.write( "\"2a%2Bd+=+4\" [the sum of the first two terms is 4]
\n" ); document.write( "\"a%2B9d+=+19\" [the 10th term is 19]

\n" ); document.write( "That is a simple system of two linear equations. Solve them to find the values of a and d; then use a and d to find the values of the 5th and 6th terms.
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