Chapter 14.1, Problem 38E

To determine

To calculate: The number of insects killed if 80 liters of brand 1 and 120 liters of brand 2 were used. If an area of land is to be sprayed with two brands of pesticide: x liters of brand 1 and y liters of brand 2. The number of thousands of insects killed is given by $f\left(x,y\right)=10,000-6500e^{-0.01x}-3500e^{-0.02y}$.