nasa pic po add lang po horizontal at vertical form lang po

Answer:
1. 14m-n+5
2. 11x²+10y²+11z²
3. -7x²+6xy-2y
4. 15mn² +13n²-13mn
5. -m+2n+7x+10+_
Step-by-step explanation:
NOTE: I put "_" for the unknown number that Cannot be seen in the lateral lower right corner of the photo.
Learning Competencies
1. Combine Like Terms
2. Combine Like Terms
3. Combine Like Terms
4. Combine Like Terms
5. Combine Like Terms