help please (picture)

Answer:
scale factor = [tex]\frac{1}{2}[/tex]
Step-by-step explanation:
The scale factor is the ratio of corresponding sides, image to original
scale factor = [tex]\frac{B'C'}{BC}[/tex] = [tex]\frac{3}{6}[/tex] = [tex]\frac{1}{2}[/tex]