Kenneth S. answered 06/15/18
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Let's cut to the chase: I know this subject & how to teach YOU
a: cannot be done unless you specify the argument(s), e.g. you could evaluate 3f(-1) + 2g(4) or any such feasible specific calculation.
b:(FoG)(-1) this can only be done provided we de-capitalize function names.
(fog)(-1) means f(g(-1)) = f(-3) = 10