Please give answer fast its urgent

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

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.

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a