For each of the pairs of functions f and g, determine whether (f o g ) is well defined, that is the range of g is a subset of the domain of f. Write (f o g) (x) explicitly if it is well defined. Also determine if (g o f ) is well defined, write (g o f)(x) explicitly if it is well defined. f: N --> N is defined by f(n) = 2 - (n)1/2. g: Z --> Z is defined by g(x) = x+7.

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