- Which is greater 4.5 or 6?

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Im having trouble on these last 2 biology questions I have. Any help would be great. Thank You.? How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form? How and when did we figure out for certain that the Earth is round? What geologic features are associated with each type of convergent boundary? For what values of k is the following integral improper? upper bound is k, lower bound is 0. (x)/(x^2-19x+90)dx?