Answer:
D. (0, 0) and r = 4.
Explanation:
3x2 + 3y2 – 12 = 36
3x^2 + 3y^2 = 48 Divide through by 3:
x^2 + y^2 = 16
Compare this with the formula:
(x - a)^2 + (y -b)^2 = r^2 where (a, b) is the centre and r = the radius.
So the centre is (0, 0) and radius = √16 = 4.