I think it should be 6.5 inch but I'm not positive.
I hope this helps! :))
Answer:
B.
Step-by-step explanation:
Answer:
5.93
Step-by-step explanation:
or 
Answer:
2x^3 + 6x^2
Step-by-step explanation:
Volumen = area * height
You already had the area which is:
x^2 + 3x
and the heigth is 2x
Volumen = (x^2 + 3x)* 2x
Volumen = 2x^3 + 6x^2