If ef = 4.2 cm, df = 3.6 cm, and de = 4.5 cm, what is cb?

The correct question in the attached figure

we know that
if the triangle ABC was rotated resulting in triangle EFD it implies that it retained it's original dimensions.

This means that ABC is proportional to EFD

hence
AB=EF-------> 4.2 cm
BC=FD-------> 3.6 cm
AC=ED------ > 4.5 cm

the answer is
CB=3.6 cm

The answer is b.the domain is the x and the range is the y. the domain stretches horizontally forever making it all real numbers. the range is y is greater than 0.