The seventh grade class enrollment went from 80 students to 60 students after summer vacation what was the percent decrease?

41/2 - 1 1/3 what is the answer as a fraction?

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Quadrilateral wxyz is on a coordinate plane. segment yz is on the line x+y=7 and segment xw is on the line x+y=3. which statement proves how segments yz and xw are related