4. Put your ticks in last three columns - where needed. Provide short explanation

Problem description	Classification
Given a set of documents you are asked to apply some fancy algorithms to segregate them into groups. Which algorithm(-s) type(-s) are applicable? Why?
Given a set of documents along with names to which group each specific document belongs to - select algorithm type(-s) which are applicable. Why?
You are given historical dataset containing features describing person (age, education, count of previous non-returned loans, count of returned loans, loan he is asking for, time duration of the load, flag (yes/no) - indicating whether loan was returned or not). Mark algorithms applicable. Why?
You are presented with time-series data of daily closing prices of forex EURUSD currency pair. You are asked to build a system capable of predicting should we buy (price goes up) now, or sell now (in near future price will go down). Using which algorithm type you would approach this problem? Why?