If a=b, then a may be replaced by b in any expression

Eastern europe and parts of northern europe have which of the following climates?

Which of the following is the main purpose of using an anchored network of booms which funnel debris to a collection area?

What must happen for new french words to be published in official dictionaries? a. they must be approved by the french academy b. they must be voted on by the people of france c. they must be used by famous french writers d. they must be used by philosophers a. they must be approved by the french academy