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Are the structures of the universe independent? How so, examples please? 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-?)=? The ratio of two numbers is 5 to 1.The sum is 18.what are the two numbers? How do you do percent increase and decrease? A 50 kg students threw a .40kg ball with a speed of 20 m/s. What was the magnitude of the impulse that the student exerted on the ball?