Question

If anyone really knows the answer please help

Answer 1

First you need to find the area of the plate.

The formula for the area of a circle is Area = pi *r^2

The radius (r) is given as 6 inches.

We will  use 3.14 for pi

Area = 3.14 x 6^2

Area = 3.14 x 36

Area = 113.04 square inches.

Now to find the density, divide the total bacteria by the area:

Density = 120,000 / 113.04 = 1061.57 which rounds up to 1,062 bacteria/ square inch.