document.write( "Question 387119: how do i write an algebric expression that represent Sn for the sequence {3,6,9,12...} and find the ninth term of this sequence \n" ); document.write( "
Algebra.Com's Answer #273642 by richard1234(7193)\"\" \"About 
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S_n = 3n, as S_1 = 3, S_2 = 6, etc.\r
\n" ); document.write( "\n" ); document.write( "S_9 = 3*9 = 27
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