The square root of 75 is 8.66, so it would be between 8 and 9
Hello!

The volume of the square pyramid is approximately 
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V = 

First, we must find the area of the square base.
A = l * w
A = 3.5 * 3.5
A = 12.25 km^2
The area of the base is 12.25 km^2. Now, multiply the base area by the perpendicular height. Then divide by 3.
V = (12.25 * 4.7) / 3
V = 19.1916666667
V ≈ 19.19 km^3
If you can send an image of the beginning of the question, I’d be glad to help. You didn’t show enough info for me to get an answer
The way the this is worded means to turn it into a improper fraction which means the answer is 11/4