Answer:
C
Step-by-step explanation:

Therefore, the correct answer is choice C. Hope this helps!
Answer:
3
Step-by-step explanation:
to find side length of squares take square root of areas
first square side length: 9
second square side length: 6
difference between 9 and 6 is subtraction, 9-6=3
7720 + 80x = 3200 + 120x
I think this is correct. Hope it helps!