Answer:
The center is at (h, k): (-3, -6) and the radius is r = 4.
Explanation:
Compare the given (x + 3)^2 + (y + 6)^2 = 16 with the standard equation of a circle (x - h)^2 + (y - k)^2 = r^2.
We can see immediately that h must be -3, k must be -6 and r must be 4.
The center is at (h, k): (-3, -6) and the radius is r = 4.