The range of the function is for the population of the deer in the salt lake if found as [P, ∞).
The number of deer is proportional to t, the number of years since 1990.
As a result, time t becomes the independent variable as well as the number of deer becomes the dependent variable; the number of deer DEPENDS upon the year.
A function's range is the set of values that the dependent variable can take.
The values in the range in this example represent the number of deer throughout salt lake in specific years.
Let 'P' be the population of the deer in salt lake.
Range: [P, ∞)
Then, the range of the function is for the population of the deer in the salt lake if found as [P, ∞).
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