Question: Wheat production W in a given year depends on the average temperature T and the annual rainfall R. Scientists estimate that the average temperature is

Wheat production W in a given year depends on the average temperature T and the annual rainfall R. Scientists estimate that the average temperature is rising at a rate of 0.15°C/year and rainfall is decreasing at a rate of 0.1 cm/year. They also estimate that at current production levels, ∂W/∂T = -2 and ∂W/∂R = 8.
(a) What is the significance of the signs of these partial derivatives?
(b) Estimate the current rate of change of wheat production, dW/dt.

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