document.write( "Question 5391: What is the sequence here? 4,9,19,39,79. Find the next term. \n" ); document.write( "
Algebra.Com's Answer #2741 by Abbey(339)\"\" \"About 
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The difference between 4 and 9 is 5
\n" ); document.write( "The difference between 9 and 19 is 10
\n" ); document.write( "The difference between 19 and 39 is 20
\n" ); document.write( "The difference between 39 and 79 is 40\r
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\n" ); document.write( "\n" ); document.write( "So it looks as if the difference is being doubled each time, so the next answer will have a difference of 2*40, or 80
\n" ); document.write( "79+80=159
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