please answer this

Ammonia, NH3, is a weak base and partially ionizes in water according to the equilibrium: NH3(aq)+H2O(l)NH4+(aq)+OH(aq)Kc=1.8105 What is the equilibrium concentration (in M ) of ammonium, NH4+, for a 0.4 M solution of ammonia? Hint:Use an ICE table. Round your answer to FOUR places past the decimal