exponential equation - Which equation best represents the following scenario: The WaterFish environmental group is concerned about a decreasing flounder fish population in the Crestdale River. There are 3000 flounder fish and they have observed the fish population deceasing by a tenth each year. Which equation should they use to show the fish population is decreasing?

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exponential equation writing an exponential function from a word problem

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Sangeetha Pulapaka (last edited 2 years ago) (Expert, Educator @Qalaxia)

Since there are no equations given to choose from, the equation which would best describe this will be,

p = 3000 \cdot\Big( \frac{1}{10}\Big)^{t} where p is the population of the fish, and t is the number of years.

This is an exponential decay function as you can see, with a decay factor of \frac{1}{10}.