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For what values of k is the following integral improper? upper bound is k, lower bound is 0. (x)/(x^2-19x+90)dx? Im having trouble on these last 2 biology questions I have. Any help would be great. Thank You.? Why do you need to use L'Hopital's Rule to find the limit below? limâ”¬( What kind of bug is this? I was just watching a show in bed and it started crawling on my arm. Also, is it harmful? Prove that A is dense in X iff A closure equals X. A subset X.?