100 POINTS PLUS BRAINLY

Answer:
[tex]\sf adjacent = 4.5 \ ft[/tex]
Given:
using tan rule:
[tex]\sf tan(x) = \dfrac{opposite}{adjacent}[/tex]
[tex]\hookrightarrow \sf tan(71) = \dfrac{13}{adjacent}[/tex]
[tex]\hookrightarrow \sf adjacent = \dfrac{13}{tan(71) }[/tex]
[tex]\hookrightarrow \sf adjacent = 4.5[/tex]
Let unknown side be x
[tex]\\ \rm\hookrightarrow tan\theta=\dfrac{P}{B}[/tex]
[tex]\\ \rm\hookrightarrow tan71=\dfrac{13}{x}[/tex]
[tex]\\ \rm\hookrightarrow 2.9=13/x[/tex]
[tex]\\ \rm\hookrightarrow x=13/2.9[/tex]
[tex]\\ \rm\hookrightarrow x=4.5[/tex]