Need help with all 3

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

What is an alternate exterior angle

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g