<span>A. an observational study, since they were not assigned to their groups.</span>
GIRL UHH TRY USING SOCRATIC HOLD ON
Answer:
3 a²b
Step-by-step explanation:
This is what I did:
3 a²b ( 5b² - 7a²)
when you try to expand this, it will give you back the original expansion so 3a²b is the greatest common factor
Answer is •D because of the seburation
