ASAP PLS HELP ME FAST HURRY

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 one ? is the answer and how to find this answer

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab