Answer:
1003
Explanation:
In order to predict the number of rabbits in the wood after 21 months, we can use the following formula:

where n is the number of months.
In this case, we want to predict the number of rabbits after 21 months, so n = 21.
Substituting this value into the formula, we get:


Rounding this number to the nearest integer, we get 1003.
Therefore, the approximate number of rabbits in the wood after 21 months is 1003.