Hey yalll? Any of you good at math!

You are assembling pieces of an iron gate to complete a fence. the finished gate will look like the one below. in order to assemble the gate it is important to under how the pieces are related. part 1: how are pies 1 and 2 in the archway related? part 2: how are the rectangular sections 5 and 6 in the center of the gate related to each other?

Need solving this second acceleration problem.

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)