What possible restrictions exist on domains and ranges of arithmetic sequences?

You cannot divide by zero and you can not have negative square roots

There cannot be multiple domains in domain and range sequence.
1 2
2 4
3 6
3 8
The equation I wrote is impossible since the domain was written twice. However you must remember the range can be repeated.

The correct graph is the second one, with the points being at (-6,0), (2,0) and reaching down to (-2,-8)