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**salma** The number of subscribers to a new cable TV company *t* months after the opening of the business is given by s(t) = 1,500t/(t + 3)^2

After one month in business, at what rate is the number of subscribers changing?

A) increase of 47 subscribers/month

B) increase of 750 subscribers/month

C) increase of 70 subscribers/month

D) decrease of 47 subscribers/month

Im not sure how to do this. what I did was plug in 1 for t and I got 93.75. When I plugged in 2, I got 120. Am I supposed to find the rate of change between these numbers??