The half-life of a substance is . At time = , this substance has size . Calculate the size of the substance at time = Practice Problem

Initial Size of at time =
<-- Half-Life
<-- Evaluate at time t_n
  

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The following practice problem has been generated for you:
The half-life of a substance is 9.
At time = 0, this substance has size 23.  Calculate the size of the substance at time = 36