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A sample of tantalum contains 200.0 micrograms of Ta-179. Determine the activity of the sample in millicuries? A family has 3 children. If X represents the number of girls amongst the children, find P(X = 0)? Why is it important to know the temperature and pressure when dealing with gases? If 2x^2+6>7x,prove that |4x-7|>1? Please demonstrate how to solve this problem. Round to four decimal places please. Thank you.?