Circumference of parts of circle

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Which expression will have the same sum as 3_8 + 1/4?

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.