Need help with my homework plz :)

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall