There are 2,100 bacteria in a circular petri dish. The dish has a radius of 40 millimeters. What is the approximate population density? (Use 3.14 for π)Area of a circle = πr2
A
0.02 bacteria per square millimeterB
0.42 bacteria per square millimeterC
2.39 bacteria per square millimeterD
52.5 bacteria per square millimeter