Find the exact value using a sum or difference identity. Some simplifications may involve using symmetry and the formulas for negatives. 
Definitions:
Growth Rate
The rate at which an organism or any of its parts increases in size or number over a specific period.
Population
A group of individuals of the same species living and interacting in the same geographical area.
Exploitation Competition
Intraspecific competition in which all the individuals in a population “share” the limited resource equally so that at high population densities none of them obtains an adequate amount. Also called scramble competition. Compare with interference competition.
Oscillate
To move or swing back and forth at a regular speed, or to vary between opposing beliefs, feelings, or theories.
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