Where did three other revolutions take place in 1830,and what was a common cause of all of them

Italy, Belgium, France, Poland, Switzerland, Portugal, Brazil. This was right at the very beginning of the rise of communism. People were tired of tyrant kings and the ruling class, so they decided to do something about it. Marx released his manifesto around this time, which cause more revolutions in 1848.

The answer to that question is a