Can some one really help meee please!

Which of the following best describes the graph below? + + 2 + 3 + 4 1 o a. it is not a function. o b. it is a one-to-one function. o c. it is a many-to-one function. o d. it is a function, but it is not one-to-one.

The area of a circle is equal to 1 dm². find the radius of the circle.

Can someone me with my math problem pls my teacher is on my back about this