If you deposit 500$ in a savings account that earns simple interest at a rate of 4.25% per year, how much interest will you have earned

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.