Khan Academy
Khan Academy: Positive and Negative Intervals
Highlight intervals on the domain of a function where it's entirely positive or entirely negative. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Increasing and Decreasing Intervals
Highlight intervals on the domain of a function where it's only increasing or only decreasing. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.