Are the points B, F, and W coplanar?

Volume of a cylinder with a radius of 13 in and height of 30 in

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?