Answer:
Hey there!
1. I can't build this for you, but this part is pretty simple. Just create the ones shown on the page.
2. The next figure would be a 6x6 square, with the middle 16 squares shaded.
3. Side Length column: 1, 2, 3, 4, 5.
Total Play Area column: 1, 4, 9, 16, 25
First Differences column: 3, 5, 7, 9
Second Differences column: 2, 2, 2
4.
