What were the enumerated powers and the implied powers

Some powers are explicitly defined by the Constitution and are called enumerated powers; others have been assumed to exist and are called implied powers.

why was the national assembly formed by the third estate?

the estates-general had not been assembled since 1614, and its deputies drew up long lists of grievances and called for sweeping political and social reforms. the third estate, which had the most representatives, declared itself the national assembly and took an oath to force a new constitution on the king.