Ineed the answer on the blank need fast

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.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?