document.write( "Question 959047: 3, 9, 24, ? \n" ); document.write( "
Algebra.Com's Answer #586738 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "Find the 1st and 2nd differences by subtracting each number\r\n" );
document.write( "from the one below it and writing the difference by that\r\n" );
document.write( "number:\r\n" );
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document.write( " 3   6   9 \r\n" );
document.write( " 9  15   \r\n" );
document.write( "24  \r\n" );
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document.write( "Put another 9 under the 9 in the 2nd differences\r\n" );
document.write( "and work your way back to the first column by adding:\r\n" );
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document.write( " 3   6   9 \r\n" );
document.write( " 9  15   9   \r\n" );
document.write( "24  24\r\n" );
document.write( "48\r\n" );
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document.write( "Answer: 48\r\n" );
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document.write( "Edwin
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