Wheat production, W, in Bushels/Acre is a function of temperature T in °C and annual rainfall, R in centimeters. Suppose that scientists observe that average temperature is increasing by 0.15°C/year and rainfall is decreasing by 0.10 cm/year. Further, it is estimated that =-2 and aw = 8. ƏR aw OT aw (a) Explain, in one or two sentences, the meaning/significance of OT aw (b) Explain, in one or two sentences, the meaning/significance of = 8. ƏR (c) Compute the current rate of change of wheat production, (t is time in years) dW dl = -2.

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