$$ Using the general logistic growth population model in the form: P*t} P(t)=\frac{L}{lta e'{-k t}} $$ 1. Solve $P(t)=\frac{L}{2}$, and show that St=\frac{\ln (a) k}$ 2. Solve $P^{\prime \prime) (t)=0$, and show that $t=\frac{\ln (a) k}$ SP.SD. 309