May 15th, 2008, 05:56 AM  #1 
Newbie Joined: May 2008 Posts: 2 Thanks: 0  need help to solve the problem
I wish to solve this euqtion to find LC 90 . I need to figure out the value of concentration which would kill 90% of toxic material. The value of a,b,c,d is known from regression . Y%=Exp^(a*con+b)+Exp^(c*con+d) I need to cut down the quation to find con value. 10%=Exp^(a*con+b)+Exp^(c*con+d) which should give me con= ? Could any body help me solve this equation. Regards Pac 
May 18th, 2008, 12:13 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,641 Thanks: 2083 
Inspect the graph of e^(a*con + b) + e^(c*con + d).


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