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Help differentiating...5th question in the image please..? What is the mass of carbon in a 5-carat diamond that contains 5.00 x 10^22 atoms of carbon? How do I find the value of cos B from: tan B/2, given tan B = -sqrt(11)/5, with pi/2 < B < pi The answer is -5/6, but how do they get it? Calculate [OH-] at 25°C for a solution having [H+] = 2.78 x 10^-7 M? A bag contains 5 red marbles, 1 green, 1 lavender, 3 yellows, and 3 orange. How many sets of five marbles include at most one yellow ?