Help me pleasee if you know

What does the phrase chamber stand for?

Type the correct answer in the box. spell all words correctly. what did german psychologists develop in the 1920s to describe how people tend to organize visual elements into groups? describe how people tend to organize visual elements into groups, or unified wholes, when applying certain principles.

What is the quotient? 2m+4/8 ÷ m+2/6