State the open intervals where the function is increasing, decreasing, or constant. (Enter your answers using interval notation. If an answer does not exist, enter DNE.increasing ___________.decreasing ___________.constant ______________. Solution By looking at the graph we can see that graph is going down from - infinity to 0 and then is constant from 0 to + infinity so there is no increasing interval decreasing interval is ( -infinity , 0 ) constant interval ( 0 , + infinity ).