(x+1)^2-(x-8)^2
please help

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 situation is an example of an observational study

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)