1.

If `C=0.003x^3+0.02x^2+6x+250` gives the amount of carbon pollution in air in an area on the entry of x number of vehicles, then find the marginal carbon pollution in the air, when 3 vehicles have entered in the area and write which value does the question indicate.

Answer» Carbon pollution in air, `C = 0.003x^3+0.02x^2+6x+250`
Marginal carbon pollution in air, `(dC)/dx = 0.003(3x^2)+0.02(2x)+6`
`=>0.009x^2+0.04x+6`
At `x=3`,
`(dC)/dx|_(x=3) = 0.009(9)+0.04(3)+6`
`(dC)/dx|_(x=3) = 0.081+0.12+6 = 6.201`
So, marginal carbon pollution is `6.201`.


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