HELP PLS

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

What is this inequality notation? t is less then or equal to 2

What is the quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl