Add or subtract the given polynomials. 
Definitions:
Exxon Valdez
An oil tanker whose 1989 spill off the coast of Alaska is considered one of the worst environmental disasters, resulting in massive oil pollution.
Nitrogen
Nitrogen is a chemical element with the symbol N and atomic number 7, making up about 78% of the Earth’s atmosphere and essential for all living organisms.
Flint, Michigan
A city in the United States known for its industrial history and a water crisis that exposed residents to lead-contaminated water.
City Life
The characteristics and daily experiences of living in densely populated urban areas, including the social, cultural, and economic facets.
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