A polynomial of degree 4 can have up to 3 local maxima/minima.
Any 4 points in the Cartesian plane determine a unique equation that is of degree at most three (i.e., a "cubic" equation). It is, of course, possible that the 4 points actually lie on a degree two ("quadratic"), a degree one ("linear"), or a degree zero ("constant") equation. However, if the 4 points do not lie on a constant, linear, or quadratic curve, then they will like on a unique cubic curve. In general, N points will determine a unique curve of degree at most (N-1).
points : infinite lines : 4 vertices : 4
4 points
4 weight watchers points
4 points
4
A starfish has a total of five points
4 points.
4 points
4 points define a plane.
Oh, dude, that's an arithmetic sequence. You know, like when you add the same number each time to get to the next number. In this case, you're adding 5, then 6, then 7... you get the idea. It's like a math puzzle, but with less excitement.
In cribbage, you can score 4 points for a run of 4 in your hand.