I need help what is n?

How many different ways can you make change for $.50 using only nickels, dimes, and quarters?

Which of those sequences is a geometric sequence

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.