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.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter4: Calculating The Derivative
Section4.EA: Extended Application Managing Renewable Resources
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### Understanding the Impact of Temperature and Rainfall on Wheat Production

**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:
\[ \frac{\partial W}{\partial T} = -2 \]
and
\[ \frac{\partial W}{\partial R} = 8. \]

(a) **Explain, in one or two sentences, the meaning/significance of \(\frac{\partial W}{\partial T} = -2\).**

The partial derivative \(\frac{\partial W}{\partial T} = -2\) indicates that for every 1°C increase in temperature, wheat production decreases by 2 bushels/acre, holding rainfall constant.

(b) **Explain, in one or two sentences, the meaning/significance of \(\frac{\partial W}{\partial R} = 8\).**

The partial derivative \(\frac{\partial W}{\partial R} = 8\) signifies that for every 1 cm increase in rainfall, wheat production increases by 8 bushels/acre, holding temperature constant.

(c) **Compute the current rate of change of wheat production, \(\frac{dW}{dt}\). (t is time in years)**

Given that:
- \(\frac{dT}{dt} = +0.15\) °C/year,
- \(\frac{dR}{dt} = -0.10\) cm/year,
  
we can compute the total derivative \(\frac{dW}{dt}\) as follows:

\[ \frac{dW}{dt} = \frac{\partial W}{\partial T} \cdot \frac{dT}{dt} + \frac{\partial W}{\partial R} \cdot \frac{dR}{dt} \]

Substituting the given values:

\[ \frac{dW}{dt} = (-2) \cdot (0.15) + (8) \cdot (-0.10) \]

\[ \frac{dW}{dt} = -0.30 - 0.80 \]

\[ \frac{dW}{dt} = -1.10 \
Transcribed Image Text:### Understanding the Impact of Temperature and Rainfall on Wheat Production **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: \[ \frac{\partial W}{\partial T} = -2 \] and \[ \frac{\partial W}{\partial R} = 8. \] (a) **Explain, in one or two sentences, the meaning/significance of \(\frac{\partial W}{\partial T} = -2\).** The partial derivative \(\frac{\partial W}{\partial T} = -2\) indicates that for every 1°C increase in temperature, wheat production decreases by 2 bushels/acre, holding rainfall constant. (b) **Explain, in one or two sentences, the meaning/significance of \(\frac{\partial W}{\partial R} = 8\).** The partial derivative \(\frac{\partial W}{\partial R} = 8\) signifies that for every 1 cm increase in rainfall, wheat production increases by 8 bushels/acre, holding temperature constant. (c) **Compute the current rate of change of wheat production, \(\frac{dW}{dt}\). (t is time in years)** Given that: - \(\frac{dT}{dt} = +0.15\) °C/year, - \(\frac{dR}{dt} = -0.10\) cm/year, we can compute the total derivative \(\frac{dW}{dt}\) as follows: \[ \frac{dW}{dt} = \frac{\partial W}{\partial T} \cdot \frac{dT}{dt} + \frac{\partial W}{\partial R} \cdot \frac{dR}{dt} \] Substituting the given values: \[ \frac{dW}{dt} = (-2) \cdot (0.15) + (8) \cdot (-0.10) \] \[ \frac{dW}{dt} = -0.30 - 0.80 \] \[ \frac{dW}{dt} = -1.10 \
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