Answer:
6cm produces the largest mosquito
Explanation:
The question has missing details.
From the complete question, the function is:

Required
Which area of rainfall produces the most mosquito
This implies that, we calculate the maximum of the function.
This is calculated as:

We have:

Rewrite as:

From the above:



So, we have:




This implies that:
---- the maximum
When rainfall is at 6cm, there is a maximum number of mosquitoes
The maximum is then calculated as:




The maximum number of mosquito is 36 million