Answer:
Article V of the Constitution provides two ways to propose amendments to the document. Amendments may be proposed either by the Congress, through a joint resolution passed by a two-thirds vote, or by a convention called by Congress in response to applications from two-thirds of the state legislatures.
Explanation: "
Four Methods of Amending the U.S. Constitution
A two-thirds vote in both houses of the U.S. Congress. Ratified by three-fourths of the state legislatures.
A two-thirds vote in both houses of U.S. Congress. ...
A national constitutional convention called by two-thirds of the state legislatures."
"The number of proposed amendments to the Constitution is an approximation for several reasons. Inadequate indexing in the early years of the Congress, and separate counting of amendments in the nature of a substitute, may obscure the total. It is also common for a number of identical resolutions to be offered on issues that have widespread public and congressional support. Finally, congressional rules limiting the number of cosponsors permitted for each proposed amendment may be a factor in the number of resolutions introduced."
