I'm trying to calculate the big oh for something

f(N) = .00001 * N^2 + .01*N + 1

g(N) = 4*log2(N)

What's the Big Oh for f and g?

What values of N are best for f(N) and g(N)

What does this tell you about using Big OH to decided which algorithm to use?

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I haven't done a whole lot with big Oh, but this is a sample problem from an old test i'm practicing off. Any help would be great.

Thanks