The domain is the set of X coordinates. (basically how far it goes on the x axis. This does not pass the vertical line test so it is not a function. If you draw vertical lines and the graph intersects with that line more than once it is not a function.
[,] instead of (,) because the circles are closed.
You first need to break each shape down. for example in the top right corner you have a pyramid and a triangular prism. find the area for those two shapes and add them together and you will have the surface area for the entire shape
