Qusetion: OXYGEN CONTENT OF A POND When organic waste is dumped into a pond, the oxidation process that takes place reduces the pond's oxygen content. However, given time, nature will restore the oxygen content to its natural level. Suppose the oxygen content t days after organic waste has been dumped into the pond is given by
f(t) = 100[(t2 - 4t + 4)/(t2 + 4)] (0 ≤ t < ∞)
Percent of its normal level .
a. When is the level of oxygen content lowest?
b. When is the rate of oxygen regeneration greatest?