Suppose that the number of thousands of insects killed by two brands of pesticide is given by the following, where x is the number of liters of brand 1 and y is the number of liters of brand 2. f(x, y) = 10,000 - 8000e-0.01x - 2000e-0.02y What is the rate of change of insect deaths with respect to the number of liters of brand 1 if 800 liters of each brand are currently being used? (Round your answer to three decimal places.) thousand insect deaths per liter

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