что такое дополнение, обстоятельство и определение? как определить зависимое и независимое слово в словосочетании

Ответьте пожайлуста на вопросы:

1. Where in Washington , D.C . you can get information about the first settlement in New England 2. Where the Capitol and the White House are situated 3 how Americans greet people when they see them for the first time 4 if Americans have an official song and what it is called 5 if all the states in the USA have their own flags, symbols and song 6 what he knows about ghost towns 7 which states are the largest and which are the smallest 8 when the first skyscrapers were built 9 if Americans travel a lot and where they usually spend their holidays 10 if there are any interesting museums in Washington and in New York

ребят, срочно нужно помогите!!!!!!!!!!!!!!!!! приведите дроби к общему знаменателю и найдите разность: 17/42-6/21