
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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<span>From what i remember in my test,
It was first unpopular because slavery was a economic contributor during that time i would have to say it was actually the most important thing at that time. Hope this helps!</span>