In my discrete math textbook, i'm stuck on exercise 25.
25) how many comparisons between values of a[j] and x actually occur when insertion sort is applied to the array of exercise 21?
here is the array from exercise 21 for reference:
a[1] = 7, a[2] = 3, a[3] = 6, a[4] = 9, a[5] = 5

15 point ! ~ see if you know the answer to both you!

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.

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).