Is square 289 a integer

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.

Find the domain of the following expression: 1/(√x)-2

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?