Answer:
B
Explanation:
It sounds more professional
I think it is either the second or third one. I think it is the 3rd one though. Cause some kids love to smile, but they have a short attention span and get distracted easy and they move a lot
Answer:(a+b) (2a-4)
Explanation:a3-2a2+2ab-4b
a(2a-2×2)+b(2a-4)
a(2a-4)+b(2a-4)
(a+b)(2a-4)