Final answer:
The 2 in the expression 2×1.55n signifies the initial views of Vanessa's kitten video. It represents the starting point before any exponential growth due to additional views over n days.
Step-by-step explanation:
The 2 in the expression 2×1.55n represents the initial views that Vanessa's video of her new kittens received on the Internet before starting to be viewed in a number of days. Exponential growth is characterized by the format of the expression, where the coefficient before the base (in this case, 1.55) raised to a variable power (n in this context) signifies the initial amount or value that is subject to growth. In the context of biology, exponential growth can describe phenomena like binary fission, where No represents the initial number of cells, and the population doubles every generation. However, in Vanessa's video example, the 2 simply means the video started with two views.