I need these done within one hour. If there re multiple answers I will give the best one brainiest and 5 stars

Answer:
a. 9ab
b. 9a
C. 4a
d. 2a^2b^2
e. -8c^3
f. 12x^3y^3
g. 25a^2
h. 2b^2
I. -2ab^2
Step-by-step explanation:
Hope this helps! Mark brainliest please worked a long time