The correct answer is the option number 1, which is:
a(v)=√(3V/8)
The explanation is shown below:
To solve this problem you must apply the following proccedure:
1. You must use the formula for calculate the volume of a square pyramid, which is:
V=a²h/3
2. Therefore, when you clear a, you obtain:
3V=a²h
3V/h=a²
a=√(3V/h)
3. You have that heigth is 8, then:
a(v)=√(3V/8)
4. So, as you can see, the correct answer is the option mentioned above.