Need help ASAP plz

I'm terrible at math any here is appreciated.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

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.