Information system homework

I have a homework that needs to be done in 10 hours from now.

there's five questtions and the first 3 from the book >> https://books.google.com/books?hl=ar&lr=&id=atfCl2agdi8C&oi=fnd&pg=PR11&dq=Easley,+D.+and+J.+Kleinberg,+Networks,+Crowds,+and+Markets:+Reasoning+about+a+Highly+Connected+World,+Cambridge,+2010&ots=LzSYUlqMAr&sig=3LCQ4sQQN91BUYVJN_Ozq-OcGzw#v=onepage&q&f=true

Its only chapter 2 and 3 .. just 3 questions