What is the solution to the inequality below? i say its b but im not sure

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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.