Suppose that the number of mosquitoes N (in thousands) in a certain swampy area near a community

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Suppose that the number of mosquitoes N (in thousands) in a certain swampy area near a community is related to the number of pounds of insecticide x sprayed on the nesting areas according to
Nx - 10x + N = 300
Find the rate of change of N with respect to x when 49 pounds of insecticide is used.
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