2022-086

Pink Dolphins Extinction Calculation

The pink dolphin is the largest freshwater dolphin in the world. It is found in northern South America, in the basins of the Amazon and Orinoco rivers. Even with the efforts of environmentalists and researchers, it is at risk of extinction.

The function below gives the number of pink dolphins after \( t \) years since the species began to be monitored.

After 5 years, if nothing is done, what is the instantaneous rate of change of pink dolphins (round to nearest integer)?

1. -209 pink dolphins per year
2. 209 pink dolphins per year
3. -674 pink dolphins per year
4. 674 pink dolphins per year
5. None of the above

Original idea by: Márcia Jacobina