Question
The amount of pollution content added in air in city due to x-diesel vehicles is given by Find the marginal increase in pollution content when 3 diesel vehicles are added and write which value is indicated in the above questions.
Solution

Differentiating w.r.t.x,
Marginal increase in pollution content

Putting x = 3 in (1), 
Therefore, the value of marginal increase pollution content is 30.255.
Increase in number of vehicles increases the pollution. We should aim at saving the environment by reducing the pollution by decreasing the vehicle density on road.

Therefore, the value of marginal increase pollution content is 30.255.
Increase in number of vehicles increases the pollution. We should aim at saving the environment by reducing the pollution by decreasing the vehicle density on road.