document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=252912>Question 252912</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The average price of a gallon of gas in the us on January 1 2006 is $2.238 on Jan 1 2007 the price was $2.334\r<BR>\n" );
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document.write( "By what percent did the price increase from January 1 2006-2007?<BR>\n" );
document.write( "Write a formula giving the price of a gallon of gas in terms of the years following 2006 if prices continue to increase exponentially at the annual rate found in part a.<BR>\n" );
document.write( "Use the formula to predict the year when the price of a gallon will reach $10<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 #185053 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=185053\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 2.238-2.334=.096<BR>\n" );
document.write( ".096/2.238=.04289=4.29%\r<BR>\n" );
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document.write( "There is no that this is an exponential increase<BR>\n" );
document.write( "x(t)=p*4.29^(t/T)<BR>\n" );
document.write( "where T is the part of the year (months)<BR>\n" );
document.write( "and p=2.238<BR>\n" );
document.write( "t is the number of years since 2006<BR>\n" );
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