Hi,
The equation looks like this...

Hope this helps.
r3t40
Answer:
round it then divide it by 5
Step-by-step explanation:
Sorry but that's an unclear question, can you double check to see if you included everything, and also check to see the possible answers?
Answer:
V=1890mm
Step-by-step explanation:
You must use its formula: which is
V=(Length x height x width) / 3
V=(15x18x21)/3
V=5670/3
V=1890mm
I believe it is A
Hope this answer helps