document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=77411>Question 77411</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Please help, I do not know what to do? The U.S. population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the United States then becomes   P(in millions) = 250 * 2^(y-1990)/66 Social science. What will the population of the United States be in 2025 if this growth rate continues? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #55558 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=55558\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The above formula for the United States then becomes <BR>\n" );
document.write( "P(year) = 250 * 2^(y-1990)/66 <BR>\n" );
document.write( "What will the population of the United States be in 2025 <BR>\n" );
document.write( "if this growth rate continues?<BR>\n" );
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document.write( "P(2025) = 250*2^(2025-1990)/66\r<BR>\n" );
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document.write( "P(2025) = 250*2^(35/66)\r<BR>\n" );
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document.write( "P(2025) = 250*2^(0.53)\r<BR>\n" );
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document.write( "P(2025) = 250*1.444229..\r<BR>\n" );
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document.write( "P(2025) = 361.0573708 million\r<BR>\n" );
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document.write( "================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );