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The variables and numbers used in the equation y = a*b^x are as follows:
- y represents the population of Pine Bluff.
- x represents the number of years after 2000.
- a represents the initial population of Pine Bluff after the period of population decline.
- b represents the growth rate or decline rate per year. If b is greater than 1, it signifies population growth, and if b is between 0 and 1, it signifies population decline.