Answer:
Micah can put 61072.56 ml³ of water in his cup.
Explanation:
The volume of a cone is given by the following formula:

In which h is the height and r is the radius.
The radius is half the diameter.
In this question:
Radius of 72/2 = 36 ml. So

Height of 45 ml, so

The dimensions are in ml, so the volume will be in ml³.
So



Micah can put 61072.56 ml³ of water in his cup.