Ineed all the questions answered . show work

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

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.

I’m stuck on this equation, anyone got the answer?