1 (days) o O A(t) (pounds) 19.9 . A water-holding tank has just been cleared of algae, but it tends to grow back quickly. The amount of algae in the tank at time t, 0 St 5, is given by a differentiable function A, where t is measured in days. The amount of algae A(t), measured in pounds, is recorded once a day and shown in the table above. (a) Use the data in the table to approximate A'(3.5). Show the computations that lead to your answer and include units of measure. "Ci (b) Is there a time ton Ost