What’s 9x12 divided by 6 x8

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

What is the order of these fractions from least to greatest 2/3 7/10 5/8 65/100

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?