Benjamin Franklin I’m pretty sure since it’s repetitive

1) x=9, because we can use the Pythagorean theorem, x^2 + 144 = 225, x^2 = 81
2)
, because 6^2 +6^2 = 72, 
3)
, because 
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Scarcity-fundamental economic problem facing all societies that results from a combination of scarce resources and people's virtually unlimited wants
Why do you mean games? This is a study app to help each other out