Heey someone plz help me quick! thx :))

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

Write 17/20 as a decimal and as a percent.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?