Silicon dioxide is dissolvable in water and has a high melting point because the atoms in the dioxide has a strong bond between them, which requires a lot of energy to break them.
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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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The most ethical action the football player could take is to report the hazard. He would be tempted by his desire to succeed/win the playoff, as it is an important game. If I was the football player, I would report the hazard because if I didn’t, someone could get hurt or my team could be punished/forced to forfeit.
