Order from least to greatest 0.5 , -0.55 , 0.05 , -0.505

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

Having a hard time understanding this question (see attachment).

Asunflower was 20 1/2 inches tall. over the next 6 months, it grew to a height of 37 inches tall. what was the average yearly growth rate of the height of the sunflower? ? plz write a proportion to solve i will give you 100 points