Current Attempt in Progress A drug concentration curve is given by C = f() = 10te-0.#, with C in mg/ml and t in minutes.\fCorrect. (b) Isf' (15) positive or negative? Isf (45) positive or negative? Explain. f' (15) is positive becausef is increasing there. f' (45) is negative because f is decreasing there. eTextbook and Media Your answer is partially correct. (c) Find f(30) and f'(30) analytically. Interpret them in terms of the concentration of the drug in the body. Round f(30) to the nearest integer and f' (30) to one decimal place. f(30) = i ng/ml f' (30) = i mg/ml/min f(30) gives the concentration of the drug in the body after 30 minutes f' (30) gives the rate at which the concentration of the drug in the body is changing per minute at 30 minutes e Textbook and Media