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Is a function that maps binary to natural numbers a bijection? If the radius of the circle is increased by 6percent the area of the circle is increased by what percentage? Does taking an Antioxidant supplement interfere with taking an Nitric Oxide precursor? With what speed would mail pass through the center of earth if falling in a tunnel through the center? 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).?