math
posted by Ted on .
a sqyuare based pyramid is on top of a cube .both shapes have the same base and the same height. which expression repreents the total volume of this shape? justify your answer

What are your choices?

What did you not like about my answer yesterday?
http://www.jiskha.com/display.cgi?id=1273956086 
thanks.
my choices are:
A. v=4b^4h^2 divided by 3
B. v=2b^4h^2 divided by 6
C. v=4b^2h divided by3
D. v=2b^2h divided by 3
E. v=4b^4h^2 divided by 6.
this is for ms.sue. 
Ted, neither in todays nor in yesterdays post did you give any dimensions.
Your choices of answers suggest that the base had side b and the height was h
so matching my answer of (4/3)x base area x height
would be C. 4b^2h/3 or (4/3) b^2 h