Please help ! i'll give brainliest to the first person who gets it right ! :,>

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

Solve the system of equations. y= 2x y= x^2 - 15

Write the expression 7x^3-28xy^2 as the product of 3 factors