Simplify the expression. Write the final answer using positive exponents only. 
Definitions:
Reticular Activating System
A network of neurons located in the brainstem that plays a crucial role in controlling arousal and the transition between sleep and wakefulness.
Neurons
Specialized cells in the nervous system that transmit information to other nerve cells, muscle, or gland cells.
Brain Stem
The part of the brain that connects the spinal cord with the forebrain and cerebrum, controlling many basic life functions such as breathing and heart rate.
Brain Stem
The part of the brain connecting the spinal cord with the forebrain and cerebrum, responsible for controlling basic life functions such as breathing and heart rate.
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