## Algebra 1: Common Core (15th Edition)

$\frac{1}{x+2}$
The area of the triangle is: $\frac{1}{2}a\times h=\frac{1}{2}x\times2=x$ The area of the rectangle is: $l\times w=x(x+2)$ Therefore, percent shaded is: $\frac{S_{triangle}}{S_{rectangle}}=\frac{x}{x(x+2)}=\frac{1}{x+2}$