document.write( "Question 1101665: the 15th term in an arithmetic sequence is 129 and the sum of the first fifteen terms is 1095. find the sum if the first ten terms. \n" ); document.write( "
Algebra.Com's Answer #716261 by josgarithmetic(39620)![]() ![]() ![]() You can put this solution on YOUR website! A, the first term \n" ); document.write( "The 15th term is \n" ); document.write( "Sum of first 15 terms is \n" ); document.write( "Two linear equations in A and d.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "A simplified system of equations: \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Sum of first ten terms? \n" ); document.write( "Simplify and compute. \n" ); document.write( " |