Answer:
She knows there are 30 unit cubes in the bottom layer. Since the height is 4, there are 4 layers of 30 cubes each. She should multiply 4 times 30 = 120. The volume is 120 cubic units.
Step-by-step explanation:
The way to figure it out is by taking the prism and just making it a rectangle, which menas that it is just 6 by 5, and then when you multiply those together you get 30 which means that one layer, or the bottom layer, is 30 and not 11. Then you have only 3 more layers left and that means that means that you need 120 unit cubes to fill up the prism.