- Would you participate in any part of a human engineering experiment?

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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).? What is the surface area of a cylinder with holes in the side? What does it mean that "everything is a code"? What area code is (656)? How much blood do you give when you give it? And how often is one allowed to donate?