The following table shows the weight W, neck size N, and chest size C for a representative

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The following table shows the weight W, neck size N, and chest size C for a representative sample of black bears.image


(a) Find values for a, b, and c so that the equation W = a +bN+ cC models these data. 


(b) Estimate the weight of a bear with a 20-inch neck and a 31-inch chest size. 


(c) Explain why it is reasonable for the coefficients b and e to be positive.

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