I can do this by working from the definition of "half-life": in the given amount of time (in this case, hours.

This method also cannot apply to the remains of aquatic life, because doesn't enter the ocean at an amount substantial enough for proper analysis.The amount of Carbon 14 contained in a preserved plant is modeled by the equation $$ f(t) = 10e^.$$ Time in this equation is measured in years from the moment when the plant dies ($t = 0$) and the amount of Carbon 14 remaining in the preserved plant is measured in micrograms (a microgram is one millionth of a gram).Students should be guided to recognize the use of the logarithm when the exponential function has the given base of $e$, as in this problem.Note that the purpose of this task is algebraic in nature -- closely related tasks exist which approach similar problems from numerical or graphical stances.