document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1124884>Question 1124884</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 7-inch sunflower is planted in a garden and the height of the sunflower increases exponentially, increasing by 15% per day. \r<BR>\n" );
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document.write( "a. Write a function f that determines the height of the sunflower (in inches) in terms of the number of days t since it was planted.\r<BR>\n" );
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document.write( "b.  How many days after it was planted will the sunflower be 28 inches tall?\r<BR>\n" );
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document.write( "c. How many days after it was planted will the sunflower be 143 inches tall? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #741250 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=741250\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> f(x)=7(1.15)^t<BR>\n" );
document.write( "28=7(1.15)^t<BR>\n" );
document.write( "1.15^t=4<BR>\n" );
document.write( "t ln 1.15=ln 4<BR>\n" );
document.write( "t=ln 4/ln 1.15=9,92 days\r<BR>\n" );
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document.write( "143=7(1.15)^t<BR>\n" );
document.write( "1.15^t=20.43<BR>\n" );
document.write( "round at end <BR>\n" );
document.write( "ln both sides<BR>\n" );
document.write( "t ln 1.15=ln 20.43<BR>\n" );
document.write( "t=21.59 days  </SPAN>\n" );
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