document.write( "Question 900070: If 30 terms are inserted between 5 and 98 to form an arithmetic sequence, find their sum.
\n" ); document.write( "i think n is 30 t1 is 5 and tn is 98 but im not sure \n" ); document.write( "
Algebra.Com's Answer #545772 by richwmiller(17219)\"\" \"About 
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n=32
\n" ); document.write( "a1=5
\n" ); document.write( "a32=98
\n" ); document.write( "S = ½(a1 + an)n
\n" ); document.write( "S = ½(5 + 98)*32
\n" ); document.write( "S = 16*(103)
\n" ); document.write( "S=1648\r
\n" ); document.write( "\n" ); document.write( "We can now find \"d\" even though it wasn't requested
\n" ); document.write( "S = ½(2a1 + (n-1)d)n
\n" ); document.write( "1648 = ½(2*5 + (31)d)32
\n" ); document.write( "1648 = 16(2*5 + 31*d)
\n" ); document.write( "1648 = 16(2*5 + 31*d)
\n" ); document.write( "103=2*5 + 31*d
\n" ); document.write( "103=10 + 31*d
\n" ); document.write( "93=31d
\n" ); document.write( "d=3
\n" ); document.write( "All 32 terms are :
\n" ); document.write( " 5, 8,11,14,17,20,23,26,29,32,
\n" ); document.write( "35,38,41,44,47,50,53,56,59,62,
\n" ); document.write( "65,68,71,74,77,80,83,86,89,92,
\n" ); document.write( "95,98\r
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