- How do I show, using limits, that f(x)=x^2-x+3 is continuous at x=2?

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I have a scientific question, can light pass through light or would the beams cause some kind of resistance and stop mid way? Why people not believe in aliens but believe in god? What are the odds that trump ( D.R. Umpf)? Find the volume obtained by rotating the graphs of f(x) = 9 - x^2 and y = 12 for 0 ≤ x ≤ 3 about the line y = 12 and then, y = 15.? What is one third of two hundred thousand dollars?