Which does NOT represent a function?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Ablock of wood is a cube whose side is x in. long. you cut off a 1-inch thick piece from the entire right side. then you cut off a 3-inch thick piece from the entire top of the remaining shape. the volume of the remaining block is 2,002 in3. what are the dimensions of the original block of wood?

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