Ineed with number 5-8 i don’t know how to do this plzz show work i’m not understanding this

What is the measure of x, in degrees

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

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.