Answer:
The volume of the given pyramid is 340.8 cubic feet.
Step-by-step explanation:
The volume of an object is a consideration of the dimensions of the object with respect to 3 dimensions. 
volume of a pyramid = 
 x base area x height
 x base area x height
But,
base area = length x width
 = 12 x 12
 = 144 square feet
So that,
volume of the pyramid = 
 x 144 x 7.1
 x 144 x 7.1
 = 
 x 1022.4
 x 1022.4
 = 340.8
The volume of the given pyramid is 340.8 cubic feet.