Answer:
escribi en español para poder ayudarte
Answer:
<h2>a₈ = 1</h2>
Step-by-step explanation:

Can only answer if you give me the sets
The 3rd one cause at first its 1ft = 10ft and it was an 8 by 8 square and now its a 4 by 4 square meaning it was divided by 2 meaning you divide 10 by 2 getting 1ft = 5ft
Think of it as 0 times 0 times 0