How to do this question i am having a problem trying to do it

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.

What is the correct decimal form of 12%

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20