Answer:
7200 yd³
Step-by-step explanation:
The volume of the water used is the product of the dimensions of the rectangular prism it occupied.
The base area is ...
A = LW = (40 yd)(30 yd) = 1200 yd²
The depth of water used is 6 yd, so the total volume used is ...
V = Bh = (1200 yd²)(6 yd) = 7200 yd³
7200 yd³ of water was used in the 3-month period.