How did the constitution fix the problems of the articles of confederation? use two of the following principles in a paragraph response: rule of law, checks and balances, separation of powers, republicanism, democracy, or federalism.

The Constitution fixed the problems of the Articles of Confederation by the following.  Article I of the Constitution, Congress can regulate interstate commerce.  It is also responsible for coinage and only Congress can regulate tariffs; in the early days of the national government, it was largely funded through land sales, excise taxes, and tariffs.  Article II gave the national government a chief executive whose job it was to execute the laws.  He had veto power over Congress, but Congress could override his veto or even vote to impeach him in extreme cases.  

i really really really really really really dont know

he supported the seperation of church and state. he also promoted religious tolerance.