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Please help me with this math problem :) If f(g(x)) = g(f(x)) = x, and g(x) = 2 + ln(x+1), find f(4).? There are many different types of fossils in our hypothetical rock layers. What do the majority of these fossils have in common? 11/4 cup water? Derivative of sin(x/2)? Where is the blueprint of the adult age of the body?