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There are lots of rectangles in this figure, but how many of them have the area we're looking for?
As long as townsfolk need to cross the river, Galileo's ferry will be at their service. But can Galileo cross safely when the current is fast?
With differently sized containers we can measure different volumes. Do the possible volumes change when a container starts partially full?
Knowing how your opponent will play in a game allows you to make the best possible move. How is this game won?
Looking at everything in this figure could get overwhelming. Instead, think about how it's built in steps.
To find the median of a data set, order the values… but can you locate the median without the exact values?
In real-life collisions, objects lose energy. How does this fact limit the height of the top ball?
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