Y could be a number of different solutions
For example, y = 12
Answer:
It's a square; vertice f is 6 units to the right of vertice e and g is 6 units above f, and h is 6 units to the left of g. This means there are four sides of equal length, with equal angles.
do you need more than that?
The answer to the question
42.875 feet cubed would be your answer.
To obtain said answer just take the side length cubed. Or: A = s^3.