Please helpp!! i'm literally so confused lol can't take this shat

The circumference of a circle is 60 pi cm3what is the radius of the circle

Which equation requires the division property of equality to be solved?

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20