The concentration, C, of phenylbutazone, in micrograms per milliliter (pg/mL), in the plasma of a calf injected with this antiinammatory agent is given approximately by C(t) = 42.382" 001045\\fb) The average amount of phenylbutazone in the calf's body for the time between 10 and 90 hours is uglmL. (Round the final answer to two decimal places as needed. Round all intermediate values to six decimal places as needed.)