SOLUTION: Dr. Jane is studying the growing population of a species of jellyfish in a body of water. Each year, she records the population of jellyfish. The first year, she recorded a populat

Question 1042489: Dr. Jane is studying the growing population of a species of jellyfish in a body of water. Each year, she records the population of jellyfish. The first year, she recorded a population of 17 jellyfish. Every following year, the population increased by four times the previous year�s population. At this rate, what will be the jellyfish population in the 9th year of her study?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The wording of this problem is somewhat ambiguous. The population increased by 4 times the previous year's population. To me, that means the first year was 17, and the 2nd year was 68+17=85. That is 17*5^1
The third year would be 85*4=425, and that is the increase, added to the start of 85. That is 17*5^2=17*25=425.
The 9th year would be 17*5^8=6,640,625
For the population to be 4 times what it was the previous year, a different picture, it would be 17*4^8=1114112

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