I got 164
Step by step:
You first want to find the volume of the rectangle.
Rectangular Volume = L x W x H
You want to multiply 5 x 8 x 2 = 80
Then you want to find the volume of the triangular prism
Triangular prism = 1/2 x B x H x L
You want to find the height of the top part of the triangular prism
So you subtract 5.5 - 2 = 3.5
3.5 = height
1/2 x 6 x 3.5 x 8 = 84
Lastly add both of the volumes up
84 + 80 = 164 ft
Not sure if it’s correct but it’s what I was able to do