document.write( "Question 891829: the sum of the finite arithmetic series 2+4+6+8...+70 is \n" ); document.write( "
Algebra.Com's Answer #540069 by LinnW(1048)\"\" \"About 
You can put this solution on YOUR website!
(70+2)/2 = 36 is the average value of an element
\n" ); document.write( "70/2 = 35 gives us the number of elements
\n" ); document.write( "So the sum is 36*35 = 1260
\n" ); document.write( "
\n" );