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# Absolute Value and Slope

EMETRC-PNWWVX

For which of the following functions is the slope undefined at $x=0$?

A

$y = x^2 + 4$

B

$y = (x + 4)^2$

C

$y = |x - 4| + 4$

D

$y = |x| + 4$

E

$y = \cfrac{1}{x+4}$