Question

What are the main duties of a vice president

Answer 1

Advise the president on matters, preside over the Senate, cast tie-breaking votes in the Senate, and take over if the President may die. 

Answer 2

The Vice President's Job: The only duty the U.S. Constitution assigns the Vice President is to act as presiding officer of the Senate. But the Vice President also serves as ceremonial assistant to the President and is an important part of the President's administration