document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1148044>Question 1148044</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose the price of a first-class stamp was 4¢ for the first time in 1958 and 44¢ in 2009. Find a simple exponential function of the form <BR>\n" );
document.write( "y = ab^t that models the cost of a first-class stamp for 1958  -  2009. (Let <BR>\n" );
document.write( "t = 0 correspond to 1958. Assume y is in dollars. Round your value for b to four decimal places.)\r<BR>\n" );
document.write( "\n" );
document.write( "y=??? \r<BR>\n" );
document.write( "\n" );
document.write( "Also how would i predict tha value for 2020?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #769419 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13203)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=769419\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Year 1958 is t=0; so year 2009 is t=51.<br><BR>\n" );
document.write( "The price in 1958 (t=0) was .04 dollars (4 cents):<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=ab%5E0+=+0.04 ALIGN=MIDDLE  ALT=\"ab%5E0+=+0.04\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a%281%29+=+0.04 ALIGN=MIDDLE  ALT=\"a%281%29+=+0.04\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a+=+0.04 ALIGN=MIDDLE  ALT=\"a+=+0.04\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "The price in 2009 (t=51) was .44 dollars (44 cents):<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.04%2Ab%5E51+=+0.44 ALIGN=MIDDLE  ALT=\"0.04%2Ab%5E51+=+0.44\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b%5E51+=+0.44%2F0.04+=+11 ALIGN=MIDDLE  ALT=\"b%5E51+=+0.44%2F0.04+=+11\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b+=+11%5E%281%2F51%29 ALIGN=MIDDLE  ALT=\"b+=+11%5E%281%2F51%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "The rest I leave to you....<br><BR>\n" );
document.write( "(1) Use a calculator to evaluate b<BR>\n" );
document.write( "(2) Form your equation y = ab^t<BR>\n" );
document.write( "(3) Check your answer by verifying that ab^51 to the nearest cent is 44 cents<BR>\n" );
document.write( "(4) For year 2020 (t=62), evaluate ab^62 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );