For this case, we have that by definition, the volume of a rectangular prism is given by:
Where:
It is the area of the base
h: It is the height of the prism
So:
So, we have:
Thus, the volume will be:
Answer:
Your answer for #5 is D,you answer for #6 is A,and you answer for #7 is C
X=-2.5
4-(2x+4)=5
cancel out 4 and -4
-2x=5
-x=2.5
x=2.5