Half life question in matlab

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Bob
Bob el 2 de Feb. de 2015
Editada: Image Analyst el 2 de Feb. de 2015
Question: Metronidazole (used to treat infections) has a half life of H = 7.9 hours. Use solve to calculate [5 pt] the amount of time it takes for 50mg to decay to 20mg. Note that the decay constant is −ln(2)/H.
Code: solve(x*(-log(2))/(log(50/20)));
Getting the wrong answer, not sure how to solve it correctly.
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Image Analyst
Image Analyst el 2 de Feb. de 2015
Editada: Image Analyst el 2 de Feb. de 2015
Didn't Star Strider and Roger already answer/help with this in http://www.mathworks.com/matlabcentral/answers/173236#answer_166376?

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