- Why is 0! equals 1 ?

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Find the two x-intercepts of f(x)=x^2-4x and show that f'(x)=0 somewhere between them? How many acetaminophen pills would it take to kill me? Just curious.? The density of a gaseous compound of phosphorous is 0.943 g/L at 457 K when its pressure is 737 Torr. What is the molar mass of the compoun? Mio papĂ ha un tumore? Is x + 8 the same as 8 + x?