document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=789137>Question 789137</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I can not figure out the expression for my son homework:<BR>\n" );
document.write( "\"A fire currently covers 420 acres and continue to spread at a rate 60 acres per day. <BR>\n" );
document.write( "a. write the expression for the total area covered by the fire in d days.<BR>\n" );
document.write( "b. The firefighter estimate that they can put out the fire at a rate 80 acres per day. Write expression for the total area can put out fire in d days.<BR>\n" );
document.write( "c. let the expression in a = expression in b. solve for d.<BR>\n" );
document.write( "Please help. Thanks much. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #478743 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39623)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=478743\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Part \"a\" could make sense if you try to think about the units, and also try to simulate what is happening (mentally) as you read the description.  \r<BR>\n" );
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document.write( "At some time 0 days, fire covers 420 acres.  In day 1, fire covers <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=420%2B1%2A60 ALIGN=MIDDLE  ALT=\"420%2B1%2A60\"   DISABLED_style= \"max-width:90%; height:auto;\" > acres; in day 2, fire covers <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=420%2B2%2A60 ALIGN=MIDDLE  ALT=\"420%2B2%2A60\"   DISABLED_style= \"max-width:90%; height:auto;\" > acres;  and this pattern is easier to see than may be others are easy to see...  In day d, the fire covers <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=420%2Bd%2A60 ALIGN=MIDDLE  ALT=\"420%2Bd%2A60\"   DISABLED_style= \"max-width:90%; height:auto;\" > acres; but you would write this expression as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=420%2B60d ALIGN=MIDDLE  ALT=\"420%2B60d\"   DISABLED_style= \"max-width:90%; height:auto;\" > acres. </SPAN>\n" );
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