The Ehrenberg equation 
gives the relationship between the height (in meters) and the average weight W (in kilograms) for children between 5 and 13 years of age.
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What is the average weight of a 10-year-old child who stands at 1.4 m tall? Round the answer to the nearest tenth. Use differentials to estimate the change in the average weight of a 10-year-old child whose height increases from 1.4 m to 1.45 m.
?
A. 44.8 kg, 3.2 kg
B. 83.9 kg, 2.9 kg
C. 58.0 kg, 1.6 kg
D. 31.5 kg, 1.6 kg
E. 31.5 kg, 2.9 kg
Answer: E
Mathematics
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