Answer with explanation:
In the given graph, the graph started increases( from left to right )after x=-5 which is represented by an open circle(o) Â i.e. x=-5 is not an included point.
Also, the graphs continues to increase until it has reached a point at x= 0 which is  represented by an closed circle  i.e. x=0 is an included point.
i.e. for -5 <x ≤0 , function f(x) is increasing.
In interval notation : (-5,0] Â Â Â Â
[We use open bracket () to show not included point and closed bracket [ ] to show included point]
Hence, the function is increasing for all [tex]x\ \varepsilon (-5,0][/tex]