The concentration of a drug in the bloodstream :3 hours after injection is given by C (t) = 6 tie0'4 t, t 2 I], where the concentration is measured in milligrams per meter. On what time interval is the concentration of the drug in the bloodstream increasing? Use fractions when necessary. The concentration of the drug is increasing from Number hours to Number hours. 4 1 Let f (:6) = 9 :63 + 6 a: 3 . Find a) critical value(s) and b) interval(s) where the function is increasing and decreasing. If there is more than one answer separate answers with a semicolon. Use -infinity for 00 and infinity for 00. Answer should be in fractional form when necessary. Do not enter spaces in your answer. a. Critical Value(s): L." b. Interval(s) where the function is increasing: ( ) Interval(s) where the function is decreasing: ( , ) E!" [3' Let f (ac) = If /CO CO / CT - x2 + 2. Find a) critical value(s) and b) interval(s) where the function is increasing and decreasing. If there is more than one answer separate answers with a semicolon. Use -infinity for -oo and infinity for co. Answers should be in fractional form, when necessary. Do not enter any spaces in the answer. a. Critical Value(s) : b. Interval(s) where the function is increasing: Interval(s) where the function is decreasing