What’s the value of X

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

Will give a: 122 b: 90 c: 48 d: 180

Ineed here’s a picture of the question