3+(-7)
solve for x help meee

Which answer is it for it to be simplified completely?

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

Asap! i'm not good math and i'm lost.