On a school trip, the ratio of teachers to students is 2:21? how many teachers are there?

Write a recursive sequence that represents the sequence defined by the following explicit formula:

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?

15 points ! ~ see if you know the answer to both you!