Practice for Sections 4.5 4.6: Problem 1 Previous Problem Problem List Next Problem (1 point) Answer the following questions for the function defined on the interval [-20, 19]. f(x) = x-9 a.) Enter the x-coordinates of the vertical asymptotes of f(x) as a comma-separated list. That is, if there is just one value, give it; if there are more than one, enter them separated commas; and if there are none, enter NONE. Answer: b.) f(x) is concave up on the region Note: Give your answer in interval notation. c.) Enter the x-coordinates of the inflection point(s) for this function as a comma-separated list. Answer: