Use the properties of exponents to simplify the expression so that only positive exponents remain. 
Definitions:
Post Office
A public department responsible for mail collection, delivery, and other postal services.
At Least 10
A term describing a scenario where the number in question is not less than 10, implying a minimum count or threshold.
Unsafe Levels
Concentrations or conditions of a substance or environmental factor that pose a risk to health, safety, or well-being.
Radioactivity
The spontaneous emission of radiation from the nucleus of an unstable atom as it changes to a more stable state.
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