24 of 25 (23 complete) 4.4.55-LS The concentration, C, of phenylbutazone, in micrograms per milliliter (ug/mL), in the plasma of a calf injected with this anti-inflammatory agent is given approximately by C(t) = 42.89 e -0.010571, where t is the number of hours after the injection and 0 Sts 110. a) Given that the model is accurate for Osts 110, what is the initial dosage? b) What is the average amount of phenylbutazone in the calf's body for the time between 15 and 110 hours