Okay. So in order to solve this problem, we really have to try out each answer and divide it by 9. A is not correct, because it does not divide evenly. B works, but let's check the others. C and D do not work, but E also works as well. If you can have two answers, 504 and 882 are both exactly divisible by 9. The answers are B: 504 and E: 882.
Yes it does mean that. As long as a number is next to a number with parenthesis with no sign in between, consider it as multiplication.
Volume = π • r² • height
Height = Volume / (PI * radius^2)
Source www.1728.com/diamform.htm
