Answer:
im pretty sure its the last image.
Step-by-step explanation:
Answer:
The expanded form of the expression
is 
Step-by-step explanation:
We need to write expanded form of the expression 
For expansion we will use distributive property of multiplication over addition

Applying above rule:

So, the expanded form of the expression
is 
The volume is 300 cubic centimeters for a triangular prism.
-18 because 2 1/4 as an improper fraction is 9/4 then it -8/1 then multiply which is -72/4 and simplified is -18.