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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).? With what speed would mail pass through the center of earth if falling in a tunnel through the center? Is a 1/2 Gallon per minute recharge rate good for a well? Explain how plate motion leads to continental drift? The partial pressure of the blue gas in the container represented in the picture is 240 mmHg. What is the partial pressure of the red gas?