How do I do this? I don't get it.

What is the measure of angle afe? 79 81 91 99

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.

Which expression can be used to find the cost of .75 kilogram of cheese at the price of $6.40 per kilogram?