Madami po points here hoping for a good answer. Please answer properly po. Need na po

Answer:
A.
- x
- 5x
- 15
- 3x
- 0
B.
- 6x
- 2
- 4
- 5x^3
- 24x
-12
- -2x
- 20
Note: sunod sunod lang yan dun sa box