Final answer:
The insect population after 3 days is approximately 282 insects.
Step-by-step explanation:
To find the insect population after 3 days, we need to evaluate the given equation at t = 3.
Substituting t = 3 into the equation 250 + 8t + 0.9t², we get:
250 + 8(3) + 0.9(3)² =
250 + 24 + 0.9(9) =
250 + 24 + 8.1 =
282.1
Therefore, the insect population after 3 days is approximately 282 insects.