I’m not sure what the rule would be in this context, but those are just the squares of decreasing numbers starting at 10. It’s 10^2, then 9^2, then 8^2, and so on.
11 boys and 8 girls because you divide it in half the add 2 and subtract 1. That isn't the wy you are supposed to do it but it works and makes since in my head.
Box of Popcorn: $3.00
Drink: $2.00
I might be wrong, but hopefully that helped! :)
Perimeter = 26 Explanation: count the sides of the shape then add them all
