Question

The function below represents the number of zombies, N, where t is the number of years since the zombies gained control of Earth:

N(t) = 300 · 2-t/8

Is this exponential growth or decay?

Answer 1

This is decay. The exponent has a negative sign. The reciprocal of 2 is 0.5. So N(t) can be rewritten as 0.5^(t/8). The base is fraction less than 1, which is decay.

Explanation:

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Answer 2

Answer: Decay

See explanation: