diameter of a white blood cell under magnification appears to be 0.3 centimeters. What is the diameter of the white blood cell in millimeters?

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To find the diameter of the white blood cell in millimeters, we need to convert centimeters to millimeters. The conversion factor between these two units is 10 because there are 10 millimeters in 1 centimeter.

So, to convert 0.3 centimeters to millimeters, we multiply it by the conversion factor:

0.3 centimeters * 10 millimeters/centimeter = 3 millimeters.

Therefore, the diameter of the white blood cell in millimeters is 3 millimeters.