The correct answers to these open questions are the following.
George Washington's Farewell Address, when and where was the source produced?
US President George Washington wrote his Farewell Address and publish it on September 19, 1976, in the Pennsylvanian newspaper "American Daily Advertiser." He received the help of James Madison to draft the document.
Washington decided to share his thought to the American people close to the end of his second term as US President when had dedicated no to run for a third term.
What contemporaneous events might have affected the author's viewpoints or message?
He basically was affected by the open polarization of political points of view between the members of his cabinet and the imminent creation of political parties in US politics.
How does the historical context in which the source was written/created affect the reliability of the source?
Since the creation of the US Constitution during the Constitutional Convention of Philadelphia in 1787, two big divisions dominated the political arena in the United States: Federalists and Antifederalists.
As time passed by, these differences grew in size and practically they seemed irreconcilable.
That is Washington openly was against the creation of political parties because these will end up dividing the nation.