How does federalism limit government power? O A. It makes sure no powers are shared by state and federal governments. O B. It denles certain powers to state and federal governments. O C. It forces states to obey the federal government in most situations. O D. It gives the federal government the power to control foreign trade. Please help me!

You are given the first four terms of an arithmetic sequence. why might you use a recursive formula? why might you use an explicit formula? under what conditions might a recursive formula be preferred over the explicit formula? under what conditions might an explicit formula be preferred over the recursive formula? pleasss ! sorry if it's a long question: (