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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Astrocytes play a critical role in normal function of the mammalian nervous system. Astrocytes regulate synaptic transmission and plasticity, protect neurons against toxic compounds, and support metabolically to ensure their optimal functioning.
I think it is ethically appropriate because he's taking a real thing that's happening and talking about it. It's giving him a topic to say about that might allow others to connect with or understand. Also depends on the topic
The answer is definitely landslide I just took a test and got that answer correct
