Domain - the set of possible x-coordinates of a function.
Range - the set of possible y-coordinates of a function.
Question 21
Domain is:
- x ∈ [- 4, 2], both ends included as part of the graph or closed circle..
Range is:
- y ∈ (-6, 6], the lowest point is excluded as open circle, the highest value is included as closed circle..
This is not a function as it fails the vertical line test.
Question 22
Domain is:
- x ∈ [- 6, 2], both ends included as part of the graph.
Range is:
- y ∈ [-7, 7], both ends included as part of the graph.
This is not a function as it fails the vertical line test.
Question 23
Domain is:
- x ∈ [ -2, 0], both ends included as closed circle or part of the graph.
Range is:
- y ∈ (-7, 5], the -7 is excluded as open circle, the 5 is included as closed circle.
This is not a function as it fails the vertical line test.
Question 24
Domain is:
- x ∈ [- 6, 6), One end is included and the other end is excluded.
Range is:
- y ∈ [-7, 1], both ends included as closed circle or part of the graph.
This is a function as it passes the vertical line test.