Please help!!! Very confused on my homework.

The tank is completely filled with water and then drains completely into the pool. The volume of the cylindrical tank is v1=36pir2/1 where r1 is the radius of the tank in feet.
PROBLEM IS ON THE ATTACHMENT!

Please help Very confused on my homework The tank is completely filled with water and then drains completely into the pool The volume of the cylindrical tank is class=