Does the graph above represent a function?

For how answer my question this will be the last question can you answer in math subject

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

The diagram represents the polynomial 4x2 + 23x – 72. what is the factored form of 4x2 + 23x – 72? (4x + 8)(x – 9) (4x – 8)(x + 9) (4x + 9)(x – 8) (4x – 9)(x + 8)