preposition = under
object of the preposition = covers
The first sentence of your answers
He is 73 years old
Explanation: He is also 73 years old
Equity is the difference between what your house is worth (today) and how much you owe on it (today). Building equity in a home is a good thing because paying DOWN what you owe and building UP what the house is worth. Hope this helps. Have a nice day.