Which of the following is a first order model?
a. y = 2.1 + 1.3x12
b. y = 2.1 + 0.5log(x1)
c. y = 2.1 + 1.3x1 + 4.1x2
d.y = 2.1 + 1.3x1 + 4.1x2 + 0.5x1x2
Correct: c
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