Answer
The vertical asymptote is the line $x=-4$.
The horizontal asymptote is the line $y=0$.
Work Step by Step
Given: $\frac{4}{x+4}$
$x+4=0$
$x=-4$
The vertical asymptote is the line $x=-4$.
The horizontal asymptote is the line $y=0$.
Make a list of values:
$x=-4 \rightarrow y=0$
$x=0 \rightarrow y=1$
$x=4\rightarrow y=\frac{1}{2}$
$x=8 \rightarrow y=\frac{1}{3}$