NEED HELP ASAP PLEASE PLEASE PLEASE​

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

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]

If 20% of a number is 35, what is 50% of that number?