PLEASE HELP

I'm bor. ed. Anyone want to do a harry potter rp?

What is the equation of the linear function represented by the table?

Which is an equation for the nth terms of the sequence 12,15,18,21

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.