Find the center and radius of the circle with the given equation. Then select the correct graph of the circle.
x2 - 4x + y2 + 8y + 4 = 0
The center is located at
and the radius is

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.