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Econometrics

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Finding a Marginal Effect With a Third Degree Polynomial

EMETRC-O4FX1P

What is the marginal effect of $x$ on $y$ if $x=1.3$ for the following function:

$$y = 1.6 + 0.6x + 0.07x^2 - 0.05x^3 \ ?$$

A

$0.5285$

B

$0.61733$

C

$0$

D

$0.6$

E

$2.32$