Rewrite each of the following expressions for concurrent processing, and then code each one. Assume that the system has four processors. Use the terms COBEGIN and COEND to delimit the sections of concurrent code. Identify which expressions, if any, might NOT run faster in a concurrent processing environment.

a. A`3*(B*(C+D) )

b. X*(Y*Z*W*R)

c. M*T*R

from Understanding operating Systems 8th Edition, Chapter 6 Excercise Question 18.