Need help will reward

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

For what value of (y) is 3^3/3^y =1/9