What language did the Eastern Empire Use? What were the advantages of that language over the western Empires language? (Keep it short, please)

Ineed answers 5 and 6 on my social studies homework reply to this question i posted

What are the winter holidays the annex residents celebrate? a. chanukah and st. nicholas b. st. nicholas and new year's c. christmas and kwaanza answer if your a 100% percent sure ^-^

Explain the importance of carnegie, morgan, and rockefeller on the american political scene of the early 1900's.