Answer:
1) Constant
2) Decreasing
3) Increasing
Explanation:
1) Graphically, we can say that a function is constant if we see a flat line, which means that the range is the same throughout its domain, in this case we have one flat line, therefore it is a constant function
2) The graph is going down as it moves from left to right in all the domain, that means it's decreasing
3) The graph is going up as it moves from left to right in all the domain, that means it's increasing.