Please see the attachment for the question.

  see below

Step-by-step explanation:

The form of the equation is that of a "logistic function." Its graph is an elongated horizontal S shape.

Horizontal asymptotes are y = 0 and where the exponential term goes to zero. Here, that is y = 1620.

The value at t = 0 is 1620/2.15 ≈ 753.

The third choice of those posted here is the best match to this description.

the correct answer to your question is a. 4^4

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