Tonya paid $20 for a skirt that was markdown 50% what was the original price of the skirt

Mr. geswein takes off 2 points for not showing work for each problem. james didn't show work on 6 problems. how many points did he lose?

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]

(urgent ) use pi 3.14 to estimate the circumference of the circle to the nearest hundredth middle is 4in (urgent )