Please help :) and if you do please show your work :)

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

Which best describes a central bank's primary goals? limiting inflation and reducing unemployment reducing unemployment and maintaining cash flow controlling stagflation and reducing unemployment managing credit and ensuring the money supply's liquidity