Is 1/5 greater than 0.2

Need ! give step by step solutions on how to solve number one [tex]\frac{9-2\sqrt{3} }{12+\sqrt{3} }[/tex] number two [tex]x+4=\sqrt{13x-20}[/tex] number three (domain and range) [tex]f(x)=2\sqrt[3]{x} +1[/tex]

Adiverr from the university of florida women’s swimming and diving team is competing in the ncaa zone b championships

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?