document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1146742>Question 1146742</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When you are 18 years old you have a hair that is 17 centimeters long, and your hair grows about 12 centimeters each year. Let H(t) be the length, in centimeters, of that hair t years after age 18.<BR>\n" );
document.write( "(a) Find a formula that gives H as a linear function of t. <BR>\n" );
document.write( "H =  ___________ *I found this answer to be 12t+17, which was correct. Now I need help with part B.\r<BR>\n" );
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document.write( "(b) How long will it take for the hair to reach a length of 117 centimeters? (Round your answer to two decimal places.) <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #768016 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39618)</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=768016\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> -------------------------------------------------<BR>\n" );
document.write( "you are 18 years old you have a hair that is 17 centimeters long, and your hair grows about 12 centimeters each year. Let H(t) be the length, in centimeters, of that hair t years after age 18.<BR>\n" );
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document.write( "t, time since age of 18;<BR>\n" );
document.write( "t=0, H=17, or point  (t,H) of  (0,17).\r<BR>\n" );
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document.write( "Basic Model <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=y=mx%2Bb ALIGN=MIDDLE  ALT=\"y=mx%2Bb\"   DISABLED_style= \"max-width:90%; height:auto;\" >, more specific as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=H=mt%2B17 ALIGN=MIDDLE  ALT=\"H=mt%2B17\"   DISABLED_style= \"max-width:90%; height:auto;\" > to fit your description.  Note, the vertical axis intercept was described.\r<BR>\n" );
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document.write( "Slope m was described as m=12 centimeters per year.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28H%28t%29=12t%2B17%29 ALIGN=MIDDLE  ALT=\"highlight%28H%28t%29=12t%2B17%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "(b)\r<BR>\n" );
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document.write( "Question tells you H(t)=117.  Solve for t. </SPAN>\n" );
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