

the dotted line. shadow under the line

solid line. shadow above the line
Answer in the attachment (graph C).
Answer with Step-by-step explanation:
We are given that

For each real number 
To prove that f is one -to-one.
Proof:Let
and
be any nonzero real numbers such that

By using the definition of f to rewrite the left hand side of this equation

Then, by using the definition of f to rewrite the right hand side of this equation of 

Equating the expression then we get




Therefore, f is one-to-one.
They are circle and triangle.
Best of luck in geometry
I would be the origin, constant of proportionality, and the unit rate.