Answer:
The sides closest to us and farthest from us, with the (visible) dimensions 4 and 8 are the bases.
The area of the base(s) is/are 26 square units.
The volume of the shape is 312 square units.
Explanation:
That base in particular with the according dimensions appears twice, meaning it can be calculated across both ways, whether it's flipped or not.
The area of the base is shown from the shape broken down: the rectangle's height (4) and the length (5) make 20 for that area, and the triangle's height (still 4) and base (8-5=3) divided by two is 6, 20+6=26.
the volume is just that 26 multiplied by 12, or 312. Or maybe 72, but probably not. try that if 312 doesn't work. I'm hungry right now, I can't think straight.
Good luck!
(And for the record, you are a very smart and great person. Keep smiling!)