#### Answer

Domain=[-4,4]
Range={-3,-1,1}

#### Work Step by Step

For problem 21 the graph shows us 6 points. Two of the points are not closed these points are (2,-3) (0.-1).
The four closed points are (-4,-3) (-2,-1) (0,1) (4,1)
This problem may seem confusing because of the two open points, but it is actually really simple. The line's range is fragmented, but its domain can be seen as a continuous line taking place at different levels.
Our domain is [-4,4].
The line, however, is not connected is fragmented for the range. This means we have to use set-builder notation to write our answer.
Our range from our closed points are -3,-1,1
Our range is {-3,-1,1}