document.write( "Question 160266: If DF=15 and DE=6, Find EF if E is between D and F. \n" ); document.write( "
Algebra.Com's Answer #118215 by HyperBrain(694)\"\" \"About 
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Flashback::\r
\n" ); document.write( "\n" ); document.write( "Definition of betweeness>>
\n" ); document.write( " B is between A and C if
\n" ); document.write( " (a) A, B, amd C are collinear, and;
\n" ); document.write( " (b) AB+BC=AC\r
\n" ); document.write( "\n" ); document.write( "so if E is between D and F, then\r
\n" ); document.write( "\n" ); document.write( " DE+EF=DF
\n" ); document.write( "but,
\n" ); document.write( " DF=15 and DE=6
\n" ); document.write( "thus,
\n" ); document.write( " 6+EF=15
\n" ); document.write( " 6-6+EF=15-6
\n" ); document.write( " EF=9\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Power up,
\n" ); document.write( "HyperBrain!
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