I don't get this... what am i supposed to do

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

Which of the following is true about a merger? a. it is an example of deregulation. c. it is a combination of two or more companies into a single firm. b. it violates the sherman anti-trust act of 1890. d. it always leads to economic growth.

Which areas where seperated by the iron curtain