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13 June, 22:03

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 0.02 bacteria per square millimeter 0.42 bacteria per square millimeter 2.39 bacteria per square millimeter 52.5 bacteria per square millimeter

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  1. 13 June, 23:01
    0
    Population Density = # bacteria/area

    Area = πr^2

    = 3.14• (40 mm) ^2

    = 3.14•1600 mm^2

    = 5024 mm^2

    Pop Density = 2100 / 5024

    = 0.418 bacteria per mm^2

    The answer is 0.42 bacteria per square mm
  2. 14 June, 01:45
    0
    your answer will be 0.42 bacteria per square millimeter
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