document.write( "Question 754351: write the explicit formula for the sequence. Then find the fifth term in the sequence.
\n" ); document.write( "asub1=3, r=-3 \n" ); document.write( "
Algebra.Com's Answer #459068 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "an = a1·rn-1\r\n" );
document.write( "\r\n" );
document.write( "a5 = a1·(-3)5-1\r\n" );
document.write( "\r\n" );
document.write( "a5 = 3·(-3)4\r\n" );
document.write( "\r\n" );
document.write( "a5 = 3·81 = 243\r\n" );
document.write( "\r\n" );
document.write( "Check it by writing them all out, multiplying by -3 each time:\r\n" );
document.write( "\r\n" );
document.write( "First term  =              +3\r\n" );
document.write( "Second term =  +3 × -3 =   -9\r\n" );
document.write( "Third term  =  -9 × -3 =  +27\r\n" );
document.write( "Fourth term = +27 × -3 =  -81\r\n" );
document.write( "Fifth term  = -81 × -3 = +243\r\n" );
document.write( "\r\n" );
document.write( "So 243 is correct.\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );