3.2 because I used my calculator which is all you need to do for this problem and I just answered the question on my quiz
Answer:

Step-by-step explanation:
a) The average value of a function is given by the following integral:



b) The determination of the minimum average daily cost per pound of pollutant is done by the First Derivative Test and the Second Derivative Test, which is:



(absolute minimum).
The level of reduction corresponding to the lowest average daily cost per pound of pollutant is:

Idk this is hard sorry I couldn't help you but you just helped me
Answer:
-2<x<= -1/2
that is the answer number 3