February 20th, 2012, 02:53 PM  #1 
Newbie Joined: Nov 2011 Posts: 14 Thanks: 0  Word Problem
The number of water hyacinth plants growing on a lake increases exponentially with time. On Tuesday the number of plants is 150. That Friday the number has risen to 240. If it takes 3400 plants to completely cover the lake, will the lake be completely covered by 20 days after Tuesday? Justify your answer.

February 20th, 2012, 04:12 PM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Word Problem Hello, doctorbleachers! Quote:
[color=beige]. . . . . . . . [/color] [color=beige]. . . . . . .[/color] [color=beige]. . . . . . . .[/color] [color=beige]. . [/color] [color=beige]. . [/color]  
February 20th, 2012, 05:18 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,926 Thanks: 2205  For t = 20, P = 3442.6 approximately, which exceeds 3400.

February 20th, 2012, 08:33 PM  #4 
Newbie Joined: Nov 2011 Posts: 14 Thanks: 0  Re: Word Problem
Sweet. Thanks!!! 

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