D= 5/6 (f+ for f. what is the solution? sorry, i'm really bad at algebra, and i was just wondering if anybody could me.

Trigonometry hellllllpppppppp asap

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]

How do you solve a question like this?