document.write( "Question 898492: What is the number that best completes the sequence on: 2 9 5 13 10 19 17 \n" ); document.write( "
Algebra.Com's Answer #544867 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
2 9 5 13 10 19 17
\n" ); document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "The other tutor used a difference table.\r\n" );
document.write( "Here's a different approach which gives the same next term.\r\n" );
document.write( "\r\n" );
document.write( "Start with--------2\r\n" );
document.write( "     add  7, get  9\r\n" );
document.write( "subtract  4, get  5 \r\n" );
document.write( "     add  8, get 13\r\n" );
document.write( "subtract  3, get 10\r\n" );
document.write( "     add  9, get 19\r\n" );
document.write( "subtract  2, get 17\r\n" );
document.write( "\r\n" );
document.write( "So it looks like the pattern is: \r\n" );
document.write( "\r\n" );
document.write( "1. We alternate between adding and subtracting\r\n" );
document.write( "2. The numbers we add go 7,8,9,etc\r\n" );
document.write( "3. The numbers we subtract go 4,3,2,etc.\r\n" );
document.write( " \r\n" );
document.write( "The next thing to do is to add, and the next number to add is 10,\r\n" );
document.write( "so we have:\r\n" );
document.write( "\r\n" );
document.write( "Start-------------2\r\n" );
document.write( "     add  7, get  9\r\n" );
document.write( "subtract  4, get  5 \r\n" );
document.write( "     add  8, get 13\r\n" );
document.write( "subtract  3, get 10\r\n" );
document.write( "     add  9, get 19\r\n" );
document.write( "subtract  2, get 17\r\n" );
document.write( "     add 10, get 27\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );