Chapter 5.4, Problem 59PE

(a)

To determine

The resulting equation, $A\left(t\right)=A_0{e}^{-kt}$ after substitution of 3 for t and $0.69$ for $A\left(t\right)$.

(b)

To determine

The resulting equation, $A\left(t\right)=A_0{e}^{-kt}$ after substitution of 4 for t and $0.655$ for $A\left(t\right)$.

(c)

To determine

To calculate: The solution to the system of equations consisting of $0.655=A_0{e}^{-4t}$ and $0.69=A_0{e}^{-3t}$ for $t=k$.

(d)

To determine

The approximate value of initial concentration $A_0$ at time of injection.

(e)

To determine

The concentration of the drug after 12 hours.