document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=200848>Question 200848</A>: <I><SPAN STYLE=\"word-break: break-all;\"> in x years from now, Robert will be k years old. How old was Robert m years ago?\r<BR>\n" );
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document.write( "The possible answers are: a) x-(k+m)<BR>\n" );
document.write( "                                               b) k-x<BR>\n" );
document.write( "                                               c) k-x-m<BR>\n" );
document.write( "                                               d) x-(k-m)<BR>\n" );
document.write( "                                               e) k+m-x <BR>\n" );
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document.write( "Thank you for helping me! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #151084 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=151084\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let r=Robert's age right now\r<BR>\n" );
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document.write( "So if \"in x years from now, Robert will be k years old\", this means that we simply add \"x\" to \"r\" to get \"k\" like so: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2Br=k ALIGN=MIDDLE  ALT=\"x%2Br=k\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Now solve for \"r\" to get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=k-x ALIGN=MIDDLE  ALT=\"r=k-x\"   DISABLED_style= \"max-width:90%; height:auto;\" >. So Robert's age right now (in terms of \"k\" and \"x\") is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k-x ALIGN=MIDDLE  ALT=\"k-x\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Now just subtract off \"m\" more years from <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k-x ALIGN=MIDDLE  ALT=\"k-x\"   DISABLED_style= \"max-width:90%; height:auto;\" > to get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k-x-m ALIGN=MIDDLE  ALT=\"k-x-m\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "So the answer is C) k-x-m\r<BR>\n" );
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document.write( "Note: if this doesn't make any sense, just plug in some values. Let's say that Robert is 12 years old. So <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=12 ALIGN=MIDDLE  ALT=\"r=12\"   DISABLED_style= \"max-width:90%; height:auto;\" >. In two years, he will be 14 (which means k=14). So this means that we'll make <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=2 ALIGN=MIDDLE  ALT=\"x=2\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Now how old was Robert 5 years ago (note: m=5)\r<BR>\n" );
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document.write( "So plug in <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k=14 ALIGN=MIDDLE  ALT=\"k=14\"   DISABLED_style= \"max-width:90%; height:auto;\" >, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=2 ALIGN=MIDDLE  ALT=\"x=2\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=5 ALIGN=MIDDLE  ALT=\"m=5\"   DISABLED_style= \"max-width:90%; height:auto;\" > into <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k-x-m ALIGN=MIDDLE  ALT=\"k-x-m\"   DISABLED_style= \"max-width:90%; height:auto;\" > to get:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=14-2-5=12-5=7 ALIGN=MIDDLE  ALT=\"14-2-5=12-5=7\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "So he was 7 years old 5 years ago (from his current age of 12) </SPAN>\n" );
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