A medical researcher has two petri dishes containing viruses. Dish B has a population density of 1.2 viruses per square millimeter. Dish A has an area of about 2,826 square millimeters.If both petri dishes have the same population density, approximately how many viruses are in Dish A?

Multiply Dish A’s area by the shared population density: 2,826 square millimeters × 1.2 viruses per square millimeter = 3,391.2 viruses. Rounding to the nearest whole virus gives approximately 3,391 viruses, so the correct choice is 3,391 viruses.

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