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? 100 128 256 320

Answer is 256.

In 1992 the trout population was 4. Thus, initial population of trout is 4. In 1993 it grew to (4)², that is 4×4 = 16, in 1994 it grew (4)³, that is 4×4×4 = 64.  This shows the trout has grown exponentially. Therefore, the trout population will be (4)⁴, that is 4×4×4×4 = 256.  

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