document.write( "Question 616826: use partial sum formulas and the information provided to find the sum :
\n" ); document.write( "1 - 4 + 16 - 64 .... n = 9\r
\n" ); document.write( "\n" ); document.write( "20 + 27 + 34 + 41 .... n = 16 \n" ); document.write( "

Algebra.Com's Answer #387996 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
\n" );
document.write( "Hi,
\n" );
document.write( " use partial sum formulas and the information provided to find the sum :
\n" );
document.write( "1 - 4 + 16 - 64 .... n = 9   Geometric  = 1 and r = -4
\n" );
document.write( "  
\n" );
document.write( "  
\n" );
document.write( "20 + 27 + 34 + 41 .... n = 16  Arithmetic  = 20 and d = 7
\n" );
document.write( "
\n" );
document.write( " \n" );
document.write( "

\n" );