1,2,4 what is the seventh number in the following sequence

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]

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10