document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=100946>Question 100946</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0131254545/algebrahomeworkh>pre-algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> i need to justify each step. 5(n+4)+9=(5n+20)+9n     <BR>\n" );
document.write( "                             =5n+(20+9n)<BR>\n" );
document.write( "                             =5n+(9n+20)<BR>\n" );
document.write( "                             =(5n+9n)+20<BR>\n" );
document.write( "                             =(5+9)n+20<BR>\n" );
document.write( "                             =14n+20<BR>\n" );
document.write( "                              \r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #75145 by </B><A HREF=/tutors/aboutme.mpl?userid=BurningFlame_marc><B>BurningFlame_marc(77)</B></A><img src=\"/images/stars/stars-08.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=BurningFlame_marc><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=BurningFlame_marc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=75145\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hello!<BR>\n" );
document.write( "I usually justify these kind of problems by stating the property used to each steps.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "=5n+(20+9n)  APA  (we used the associative property of addition to get this)<BR>\n" );
document.write( "=5n+(9n+20)  CPA (we used the commutative property of addition to get this)<BR>\n" );
document.write( "=(5n+9n)+20  APA  (we used the associative property of addition to get this)<BR>\n" );
document.write( "=(5+9)n+20   DPMA(we used the distributive property of multiplication to get this)<BR>\n" );
document.write( "=14n+20      ADDITION(we just simply add to get this)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "*associative property of addition means that if you change the groupings of the numbers,it won't affect the sum.<BR>\n" );
document.write( "*commutative property of addition means that if you change the order of the numbers it won't affect the sum. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );