document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=974782>Question 974782</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Need help on how to work this problem and steps on how to solve it....Thank you :)\r<BR>\n" );
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document.write( "Based on data from June 2006, the forecast for maximum 5-day snow runoff volumes for the American River at Folsom, CA, can be modeled by <BR>\n" );
document.write( "v = f(t) = &#8722;2.606t + 131.8\r<BR>\n" );
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document.write( " thousand acre-feet, where t is the number of days since the end of May 2006.† That is, the model forecasts the snow runoff for the 5-day period beginning on the selected day of June 2006. Find the inverse function.\r<BR>\n" );
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document.write( "f&#8201;&#8722;1(v) = \r<BR>\n" );
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document.write( "Determine the value of \r<BR>\n" );
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document.write( "f&#8201;&#8722;1(61.8).<BR>\n" );
document.write( " (Round your answer to two decimal places.)\r<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 #596613 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=596613\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> v = f(t) = &#8722;2.606t + 131.8 <BR>\n" );
document.write( "solve for t<BR>\n" );
document.write( "&#8722;2.606t = v -131.8<BR>\n" );
document.write( "t = -(v - 131.8) / 2.606<BR>\n" );
document.write( "now interchange t and v<BR>\n" );
document.write( "v = -(t - 131.8) / 2.607, therefore<BR>\n" );
document.write( "f-1(t) = -(t - 131.8) / 2.606<BR>\n" );
document.write( "f-1(t) = (131.8 - t) / 2.606<BR>\n" );
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document.write( "f-1(61.8) =  (131.8 - 61.8) / 2.606<BR>\n" );
document.write( "f-1(61.8) = 26.861089793 approx 26.86<BR>\n" );
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