Which are the center and radius of the circle with this equation?
x^2 - 4x + y^2 + 2y = 0

Identify the parent function that can be used to graph the function f(x)= (1/4x)^3

What is the value of x? enter your answer in the box. (cm)

Fiona races bmx around a circular dirt course. if the radius of the course is 70 meters, what is the total distance fiona covers in two laps of the race? a. about 30,772 meters b. about 15,386 meters c. about 879.2 meters d. about 439.6 meters e. about 219.8 meters23 points hurry