document.write( "Question 1135126: find the sum of the first 12 terms of the sequence and write down the equation.
\n" ); document.write( "1, -4, -9, -14, . . . \n" ); document.write( "
Algebra.Com's Answer #752692 by MathTherapy(10559)\"\" \"About 
You can put this solution on YOUR website!
find the sum of the first 12 terms of the sequence and write down the equation.
\n" ); document.write( "1, -4, -9, -14, . . .
\n" ); document.write( "
One of the formulas for the SUM of an A.P. is: \"matrix%281%2C3%2C+S%5Bn%5D%2C+%22=%22%2C+%28n%2F2%29%282a%5B1%5D+%2B+%28n+-+1%29d%29%29\", with: 
\n" );
document.write( "Substitute values for the variables and you should get, sum of A.P., or: \"highlight_green%28matrix%281%2C3%2C+S%5Bn%5D%2C+%22=%22%2C+-+318%29%29\".
\n" );
document.write( "NEVER go the route the other person suggests as it's very time consuming and EXTREMELY INEFFICIENT. What if there were 20, or 50, or 200 terms? 
\n" );
document.write( "Would she suggest the same method to you? Seeing what she usually does, I bet she would! \n" );
document.write( "
\n" );