Pennsylvania Keystone Test

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A researcher is tracking the population of a certain species of bird. The population started at 80 and has been decreasing by 6 birds each year. Which function, P(t), correctly models the bird population after t years?

P(t) = 80t - 6 P(t) = 6t - 80 P(t) = 80 + 6t P(t) = 80 - 6t

Correct Answer:

P(t) = 80 - 6t

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