Pls help me with this and I’ll give brainliest to you

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.

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

Y+ 2/y is it a polynomial in one variable or not? and if so, why?