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There are many different types of fossils in our hypothetical rock layers. What do the majority of these fossils have in common? WHY THE SKY BLUE ? For what values of k is the following integral improper? upper bound is k, lower bound is 0. (x)/(x^2-19x+90)dx? What is the normality of an acid if 21.18 mL were needed to titrate 0.1369 g Na2CO3? Why do you need to use L'Hopital's Rule to find the limit below? limâ”¬(