Answer:
center = (2, -4)
radius = 4
Step-by-step explanation:



Equation of a circle: 
(where (h, k) is the center and r is the radius)
Therefore,
- center = (2, -4)
- radius = √16 = 4
It’s impossible because any number divided by 0 will always just be 0
6 is in the ten millions place. The number next to 6 is 1, which is less than 5, so you round down. The nearest 10 million is 60,000,000.