Can someone help me pls I need help so bad thank you if you can pls help thank very much it really means it to me.

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

Evaluate cos2θ for cosθ = square root of 3/2

Which of the following is the result of expanding the series