write an expression that can be used to find the number of toothpicks needed to make any figure. Then find the number of toothpicks needed to make the eighth figure

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]

Answer question above and explain each step : )

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?