I neeed your help please

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

Three coins are flipped. what is the probability that there will be at least two tails?

Which of the following tables represents exponential functions?