Answer:
x = 5
Step-by-step explanation:
The triangles are similar ( AA postulate ) then the ratios of corresponding sides are in proportion , that is
[tex]\frac{x}{40}[/tex] = [tex]\frac{4}{32}[/tex] = [tex]\frac{1}{8}[/tex] ( cross- multiply )
8x = 40 ( divide both sides by 8 )
x = 5
