What is the degree of

f (x) = 2

x

4

-5

x

3

+3

x

2

+7x-1

f (x) = 2x4-5x3+3x2+7x-1

?

In an area of the Great Plains, records were kept on the relationship between the rainfall (in inches) and the yield of wheat (bushels per acre). Find the equation of the regression line for the given data.

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