can someone please do this :// I need B done on Question 9 but I'm so mad because no one is giving me a correct fkin answer

Answer:
9.
4= length A
3= width B
B. The volume is 72
Step-by-step explanation:
I got 72 by making the whole shape into 2 different shapes and finding the volume of those first. I am not sure if this is correct but I hope it is and I hope this helps! :)