How do you solve a trigonometry problem if you have one side length of 12 and two angles one being 90° and the other being 54°?

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Can someone me and do the problem plz so i can understand it more better

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.