Atrout population grew from 4 in 1992 to 16 in 1993 and then to 64 in 1994. if it continued to grow exponentially, approximately how many trout were there in 1995?
100
128
256

256

Explanation:

The exponential growth function of population is given by :-

, where A is the initial value ,b is the growth factor and t is the time period.

Since in the exponential growth ,the growth factor is the common ratio of the population in the  consecutive years.

Consider 1992 as the initial year , then A=4

and for 1995 , Time period x=3

Now, the number of trouts in year 1995 will be :-

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