Which property is shown? 4/5+ - 4/5=0

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?