Help me help me help me help me

The circumference of a circle is 5 pi cm. what is the area of the circle?

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 location of point g, which partitions the directed line segment from d to f into a 5: 4 ratio? –1 0 2 3