The perimeter of a quarter circle is 48.28 miles. What is the quarter circle's radius

Can someone me and plz do the problem

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 23 = 10x a. -1.93, 11.93 b. 1.93, -11.93 c. 1.93, 11.93 d. -1.93, -11.93

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)