The concentration of a certain drug in a patient's bloodstreamthr after injection is given by the following function. 0.2t C(t) - (a) Find the rate at which the concentration of the drug is changing with respect to time. C'(t) - (b) How fast is the concentration changing 1/2 hr, 3, and 9 hr after the injection? (Round your answers to four decimal places.) after 1/2 hr percent/hr after 3 hr percent/hr after 9 hr percent/hr

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