What is a rectangles dimensions if the perimeter is 20 and the area is 24?

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

Which of the following three dimensional figures has a circle as it’s base

Ineed here’s a picture of the question