Run add operations on a min heap implementation of PriorityQueue.

Using a heap above what will be the numerical index of $7$ after the first step of add$(7)?$

Using a heap above what will be the numerical index of $7$ after the add$(7)$ fully completed?

Using a heap above with $7$ inserted, what will be the numerical index of $15$ after the first step of add$(15)?$

Using a heap above with $7$ inserted, what will be the numerical index of $15$ after the add$(15)$ fully completed?