Answer:
1008yd^3
Explanation;
The formula for finding the volume of a pentagon is expressed as;
V = A*h
A is the base area
h is the height of the polygon = 12yd
A = 1/2(5s*a)
s is the side length of the polygon = 7yd
a is the apothem = 4.8yd
Substitute and get the base area
A = 1/2 (5*7*4.8)
A = 1/2 * 168
a = 84yd^2
Volume of the pentagon = 84 * 12
Volume of the pentagon = 1008yd^3