document.write( "Question 965862: Can you help me understand how to approach this sequence:
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Algebra.Com's Answer #590554 by Edwin McCravy(20054) $\"\"$ $\"About$

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3, -6, 12, 4, 20, \r
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document.write( "Look at the red numbers below.  They go -9,-8,-7,-6,...\r\n" );
document.write( "Look at the blue numbers below. They go 18,16,14,12,... \r\n" );
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document.write( "3 + -9 = -6\r\n" );
document.write( "         -6 + 18 = 12\r\n" );
document.write( "                   12 + -8 = 4\r\n" );
document.write( "                             4 + 16 = 20\r\n" );
document.write( "                                      20 + -7 = 13\r\n" );
document.write( "                                                13 + 14 = 27\r\n" );
document.write( "                                                          27 + -6 = 21\r\n" );
document.write( "                                                                    21 + 12  \r\n" );
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document.write( "Notice also that each blue number is -2 times the preceding red number.\r\n" );
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document.write( "Edwin

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