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The Half life of cobalt -60 is 5.26 Years how much of 200 g cobalt -60 will remain after 26.3 Years? Amount=200(1-?)=? Determine the mass that must be supported at A and the angle theta of the connecting cord in order to hold the system in equilibrium.? Find the principal unit normal vector to the curve at the specified value of the parameter. r(t) = cos(3t)i + 2 sin(3t)j + k, t = π? Rectangular to polar equation question.? What happens when you leave mayonnaise out on the counter for a few days?