Math problem.. 16 points and very easy problem

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.

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

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)