Yo this is confusing, anyone help? plz? if they are similar there are more questions. they'll be shown in the second image

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.

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)