25 points please answer simple maze math with angles

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]

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)