√23 rational or irrational ? 17/18 rational or irrational ? -√81 rational or irrational ?

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.

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles