22. Simplify these expressions (+ = + inside a circle or 'direct sum')
1. x + 0
2. x + 1
3. x + x
4. x + x-bar
For each topic, demonstrate a knowledge and capability by giving the following information:
1) Problem Solution: (solution for an even number problem)
2) Personal Observation: (personal comment on the topic including advice to others on how to study and understand it).
Direct sums are found.