We need more context to answer your question
In the year 2009 there were 3500 birds on an island. If the bird population is declining 2.2% per year it means that in the year 2014 we will have 3500*

= 3131.57 birds.
The best prediction is that in the year 2014 the bird population will be 3132.
Answer: the answer is 15.5 I did it on Delta Math and got it right!!
TRUST ME WITH THIS ANSWER!!