Question 513780
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*[tex \LARGE \ \ \ \ \ \ \ \ \ \ (f\ \circ\ g)(x)\ =\ f\left(g(x)\right)\ =\ f\left(\sqrt{x}\right)\ =\ g(x)\ -\ 2\ =\ \sqrt{x}\ -2]


That should be enough information for you to figure out the other parts by yourself.  Don't forget to rationalize your denominators when you do C and E.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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