Question

A researcher places a pinpoint of bacteria 8mm to the left of the center of the Petri dish and 8mm above the center. This strain of bacteria grows in a circular pattern with a diameter of 4mm. Which equation represents the outside of the bacteria colony relative to the center of the dish?

A) ( x+8)^2 + (y-8)^2 =16. B) ( x+8)^2 + (y-8)^2 =4
C) ( x+0)^2 + (y+16)^2 =16. D) ( x+0)^2 + (y+16)^2 =4