document.write( "Question 772954: What is the common difference of a 57-term arithmetic sequence where the first term is -25 and the sum is 17,727?
\n" ); document.write( "
\n" ); document.write( " 11
\n" ); document.write( " 11.5
\n" ); document.write( " 12
\n" ); document.write( " 12.5
\n" ); document.write( "

Algebra.Com's Answer #471213 by josgarithmetic(39625)\"\" \"About 
You can put this solution on YOUR website!
Your general term is \"%28-25%29%2B%28n-1%29%2Ad\" with common difference d, and for the sum of the terms,\r
\n" ); document.write( "\n" ); document.write( "\"%28n%2F2%29%28%28-25%29%2BLastTerm%29=17727\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "For the LastTerm, you know n=57 but still not know d. This term is like, \"%28-25%29%2B%2857-1%29d\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Put this all into the sum equation and as n=57.
\n" ); document.write( "\"highlight%28%2857%2F2%29%28%28-25%29%2B%28%28-25%29%2B%2857-1%29d%29%29=17727%29\"
\n" ); document.write( "Solve for d.
\n" ); document.write( "
\n" );