document.write( "Question 386369: Two terms of an arithmetic sequence are a9 = 85 and a30 = 295. Find a rule for the nth term. \n" ); document.write( "
Algebra.Com's Answer #273151 by scott8148(6628)![]() ![]() You can put this solution on YOUR website! the 21 differences between a9 and a30 equals 210 (295-85) \n" ); document.write( "so the difference between consecutive terms is 10 (210/21)\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "an = nd + a0 ___ a9 = 9(10) + a0 ___ 85 = 90 + a0 ___ -5 = a0\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "an = n(10) - 5 \n" ); document.write( " |