document.write( "Question 864382: the sum to n terms of a sequence of numbers is given as Sn=n/2(5n+9).
\n" ); document.write( "1.calculate the sum to 23 terms of the sequence
\n" ); document.write( "2.calculate the 23rd term
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Algebra.Com's Answer #521000 by richwmiller(17219)\"\" \"About 
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Sn=n/2(5n+9)
\n" ); document.write( "S23=23/2(5*23+9)\r
\n" ); document.write( "\n" ); document.write( "S23 = 1426
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