Question 988651
The height is the height of the cylinder plus the radius of the hemisphere on top.
Volume of the height part is V=pi*r^2h=225pi*h

The hemisphere has volume (2/3)*pi*15^3, since the "height" of the top is really the radius of the hemisphere. That is 2250pi
That leaves 225pi*h=11,250 pi, subtracting the top.
11250 pi/225 pi=50, as you had.

BUT, that is the height of the non-hemisphere part.
The hemisphere itself is the radius high, or 15 feet in its own right.
So the sum of 50+15 is 65 feet.