Please write out in interval notation using brackets and parentheses

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. 0,0,... (0,0) [0,0] (0,0] [0,0) - OO None X 5