ALT Poster text: "Some numbers have digits that are: like 4321, always decreasing; like 3214, sometimes decreasing; like 1134, never decreasing. Using only 1s, 2s, 3s, and 4s, how many 4-digit numbers are never decreasing?"
ALT With just one fold, you can make a rectangle into a nine-sided polygon. [Image of a rectangle being folded unevenly down the center to create a polygon with sides numbered 1 through 9.] How many sides can you make with two folds?
ALT Image text: "This special pentagon is called a sphinx." One copy of the pentagon is shown. "Use some copies of the sphinx..." 10 smaller copies of the pentagon are shown, seemingly thrown together in a pile. "...to make a bigger sphinx." A final, larger copy of the sphinx is shown.
ALT Image text: "This special pentagon is called a sphinx." One copy of the pentagon is shown. "Use some copies of the sphinx..." 10 smaller copies of the pentagon are shown, seemingly thrown together in a pile. "...to make a bigger sphinx." A final, larger copy of the sphinx is shown.