Multiple Choice
Suppose that the number of thousands of insects killed by two brands of pesticide is given by
, where x is the number of liters of Brand X and y is the number of liters of Brand Y. What is the rate of change of insect deaths with respect to the number of liters of Brand X if 100 liters of each brand are currently being used? Round your answer to two decimal places.
A) 
B) 
C) 
D) 
E) 
Correct Answer:
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