document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1125095>Question 1125095</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 8-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.<BR>\n" );
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document.write( "b. How many days after it was planted will the sunflower be 25 inches tall?\r<BR>\n" );
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document.write( "c. How many days after it was planted will the sunflower be 138 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 #741415 by </B><A HREF=/tutors/aboutme.mpl?userid=fcabanski><B>fcabanski(1391)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fcabanski><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=741415\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> N = 8(1+.15)^d  d is the number of days, and N is the height after d days.<P>\r<BR>\n" );
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document.write( "b.  25 = 8(1.15)^d\r<BR>\n" );
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document.write( "log25 = log(1.15)^d = dlog(1.15)\r<BR>\n" );
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document.write( "log25/log1.15 = d = 23.03 days = around 23 days.<P>\r<BR>\n" );
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document.write( "c.  Likewise for 138 inches it's log138/log1.15 = about 35 days\r<BR>\n" );
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