Can you explain this?

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.

Rationalize the denominator- 12x/√x-10

F(x)=5/6x+3 which of the following is true