help asap please, will mark brainliest

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?

What is the number 321,000,000 in scientific notation? also what is the number? ?

It says factor each expression completely 8y+48