What is a equation for 11 5 and b

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]

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

The function show two sisters' savings account and the rate at which they plan to deposit money