What is the volume of the cylinder below?

The answer is D. 36pi units^3
Hope this helps!
The formula for cylinder volume is: pi*r^2*h
For this case we have that the volume of the cylinder is given by:
[tex]V = \pi * r ^ 2 * h[/tex]
Where:
h: It is the height of the cylinder
A: It is the radius of the cylinder
We have to, according to the given data:[tex]h = 4\\r = 3[/tex]
Substituting:
[tex]V = \pi * (3) ^ 2 * 4\\V = \pi * 9 * 4\\V = 36 \ pi[/tex]
[tex]36 \pi \ units ^ 3[/tex]
ANswer:
Option D
[tex]36 \pi \ units ^ 3[/tex]