This figure represents the base of a fish tank that is 8 inches high. What is the volume of the fish tank?

378 in³

408 in³

480 in³

768 in³

Image shows a polygon that looks like a rectangle with a triangle attached to the bottom right side of it. The polygon has 5 sides. The top side is 6 inches long. The left side is perpendicular to the top side and is 13 inches long. The right side is perpendicular to the top side also and is 7 inches long. A side at the bottom is perpendicular to the 7 inch side and is 3 inches long. It looks like it stops almost midway across the bottom. The last segment is slanted and connects the 3 inch segment to the left side. This slanted side is not labeled.