document.write( "Question 472774: I can't tell which sequence I should be using in order to solve this equation...
\n" ); document.write( "You need to find the 11th term.\r
\n" ); document.write( "\n" ); document.write( "-10, 20, -40, 80 \n" ); document.write( "

Algebra.Com's Answer #324113 by Tatiana_Stebko(1539) $\"\"$ $\"About$

You can put this solution on YOUR website!
-10, 20, -40, 80 a geometric progression
\n" ); document.write( " $\"a1=-10\"$
\n" ); document.write( " $\"r=a2%2Fa1=20%2F%28-10%29=-2\"$
\n" ); document.write( "Formula $\"an=a1%2Ar%5E%28n-1%29\"$
\n" ); document.write( "the 11th term $\"a11=a1%2Ar%5E%2811-1%29=-10%2A%28-2%29%5E10=-10%2A1024=-10240\"$ \n" ); document.write( "

\n" );