What are the remaining angel measures if the figures is to be a parallelogram

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

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.

Could somebody me with this radical simplification?