Suppose that the function f is defined, for all real numbers, as follows. 3 f(x)= (x-1) if-1 Determine the interval(s) on which the function is (strictly) decreasing. Write your answer as an interval or list of intervals. When writing a list of intervals, make sure to separate each interval with a comma and to use as few intervals as possible. Click on "None" if applicable. 0 Dio [0.0) (0.0] [ 00 8 None 0.0 X 5