Math help pls! i’m not sure how to solve this problem

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]

If m 17 27 90 63 ** picture is attached

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be