Write the pair of fractions as a pair of fractions with a common denominator 3/10 and 2/5

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

Me asap! what is the slope of this line? enter your answer in the box.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?