A) is the answer. The island in decaying by 10% each year, which means the amount will change within the period of the decay.
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To find the range of data, you first order the data least to greatest:
7, 12, 15
Then you subtract the smallest number from the largest:
15-7=8
The range is 8.
Answer:
a fixed sum of money paid to someone each year, typically for the rest of their life.