- Smallest positive value of x such that cos 3x =-1/2?

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Is it possible to not die with 40 grams of caffeine? 200 cubic ft of air at 14.7 psia is compressed to 90 psig. What volume of receiver is required? If amp has 0.5Ohm impedance and we connect a 0.36Ohm speaker but only use it at 20KHz where overall imedance is more than 0.5Ohm is that ok? Find a unit vector in the opposite direction as the given vector: v = 0.1i − 0.2 j.? In nature, what keeps predators from hunting prey to extinction? Why doesn't it work with humans?