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Population growth is proportional to the current population. For example, if a town has people, its change in population for a year will be based on those people. Therefore, its change will be much smaller than that of a large city like San Francisco, with population . Why? Write down your reasoning

If population growth is proportional to current population, set up a proportional equation to model this statement.
Remember the constant of proportionality.

What 'type' of function must it be?
Is it: linear, quadratic, trigonometric, exponential, or something else?