The domain is the set of all possible x-values which will make the function "work", and will output real y-values

there is not a value for x, that makes the function does not "work", so x can take any value, in other words all real numbers
so, the answer is all real numbers
Answer:
the last option is coorect
1. each number visual always has a shape in each one. all you do is add one each time.
2. the numbers are shown in shapes inside of shapes.
3. each pattern has one more shape in it than the others.